Remove vscode-webview-ui-toolkit

Summary:
We no longer need this dependency! Also remove some vestigial remains

If we compare production builds before and after (not on this diff but actually comparing the last diff that included any of vscode-webview-ui-toolkit):

## Before
```
$ yarn build
...
build/assets/index-qm3bXTUa.js                         913.69 kB │ gzip: 264.20 kB
```

## After
```
$ yarn build
...
build/assets/index-DOWvZMsB.js                         732.80 kB │ gzip: 219.89 kB
```

That's **-20% build size** (-15% gzip'd) for the main bundle (some other ui-containing bundles are also smaller)

Admittedly the before is also counting the other components we had to add to make this migration, however those components are quite simple, and I really doubt they take up anywhere near 20% of the app.

In fact, the isl/components folder has a mere 1,279 lines of code, compared to 83k LOC for isl (excluding isl-server/), so I'd expect it's more like 1-2% of the bundle size.

Reviewed By: quark-zju

Differential Revision: D58702152

fbshipit-source-id: 575e29bf1efd88a7ad9231ed489b2479f25aba54

addons/isl/package.json

@@ -12,7 +12,6 @@
     "@types/react": "^18.3.1",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "^4.2.1",
-    "@vscode/webview-ui-toolkit": "1.2.2",
     "diff": "^5.0.0",
     "fast-deep-equal": "^3.1.3",
     "immutable": "^4.3.0",

addons/isl/src/UncommittedChanges.tsx

@@ -80,7 +80,6 @@ import {selectedCommits} from './selection';
 import {latestHeadCommit, uncommittedChangesFetchError} from './serverAPIState';
 import {GeneratedStatus} from './types';
 import * as stylex from '@stylexjs/stylex';
-import {VSCodeButton} from '@vscode/webview-ui-toolkit/react';
 import {useAtom, useAtomValue} from 'jotai';
 import React, {useCallback, useMemo, useEffect, useRef, useState} from 'react';
 import {ComparisonType} from 'shared/Comparison';

addons/yarn.lock

@@ -1782,36 +1782,6 @@
     "@jridgewell/resolve-uri" "^3.0.3"
     "@jridgewell/sourcemap-codec" "^1.4.10"
 
-"@microsoft/fast-element@^1.10.4", "@microsoft/fast-element@^1.6.2", "@microsoft/fast-element@^1.9.0":
-  version "1.10.4"
-  resolved "https://registry.npmjs.org/@microsoft/fast-element/-/fast-element-1.10.4.tgz"
-  integrity sha512-SD0L3Kt++VSTqdkmGupB5tNaSLboEB7H/rh70a4eECpzCQewEzjd85jVNpgab1A8n5d3N9sPwZGIyfiUN6x4hg==
-
-"@microsoft/fast-foundation@^2.38.0", "@microsoft/fast-foundation@^2.41.1":
-  version "2.46.11"
-  resolved "https://registry.npmjs.org/@microsoft/fast-foundation/-/fast-foundation-2.46.11.tgz"
-  integrity sha512-5ehg6l2g/PsAR+90EEWSR7QAiAKsdscAnP6upE2ysp2U1luER4tAVDIP2wGQneLhaHq2i4Htnb4t+K1dcrw6AQ==
-  dependencies:
-    "@microsoft/fast-element" "^1.10.4"
-    "@microsoft/fast-web-utilities" "^5.4.1"
-    tabbable "^5.2.0"
-    tslib "^1.13.0"
-
-"@microsoft/fast-react-wrapper@^0.1.18":
-  version "0.1.48"
-  resolved "https://registry.npmjs.org/@microsoft/fast-react-wrapper/-/fast-react-wrapper-0.1.48.tgz"
-  integrity sha512-9NvEjru9Kn5ZKjomAMX6v+eF0DR+eDkxKDwDfi+Wb73kTbrNzcnmlwd4diN15ygH97kldgj2+lpvI4CKLQQWLg==
-  dependencies:
-    "@microsoft/fast-element" "^1.9.0"
-    "@microsoft/fast-foundation" "^2.41.1"
-
-"@microsoft/fast-web-utilities@^5.4.1":
-  version "5.4.1"
-  resolved "https://registry.npmjs.org/@microsoft/fast-web-utilities/-/fast-web-utilities-5.4.1.tgz"
-  integrity sha512-ReWYncndjV3c8D8iq9tp7NcFNc1vbVHvcBFPME2nNFKNbS1XCesYZGlIlf3ot5EmuOXPlrzUHOWzQ2vFpIkqDg==
-  dependencies:
-    exenv-es6 "^1.1.1"
-
 "@n1ru4l/graphql-live-query@^0.9.0":
   version "0.9.0"
   resolved "https://registry.npmjs.org/@n1ru4l/graphql-live-query/-/graphql-live-query-0.9.0.tgz"
@@ -2516,15 +2486,6 @@
   resolved "https://registry.yarnpkg.com/@vscode/codicons/-/codicons-0.0.33.tgz#a56243ab5492801fff04e53c0aab0d18a6521751"
   integrity sha512-VdgpnD75swH9hpXjd34VBgQ2w2quK63WljodlUcOoJDPKiV+rPjHrcUc2sjLCNKxhl6oKqmsZgwOWcDAY2GKKQ==
 
-"@vscode/[email protected]":
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/@vscode/webview-ui-toolkit/-/webview-ui-toolkit-1.2.2.tgz#f071ec7434b2733d1c724fa874341ec20998f930"
-  integrity sha512-xIQoF4FC3Xh6d7KNKIoIezSiFWYFuf6gQMdDyKueKBFGeKwaHWEn+dY2g3makvvEsNMEDji/woEwvg9QSbuUsw==
-  dependencies:
-    "@microsoft/fast-element" "^1.6.2"
-    "@microsoft/fast-foundation" "^2.38.0"
-    "@microsoft/fast-react-wrapper" "^0.1.18"
-
 "@webassemblyjs/[email protected]":
   version "1.11.1"
   resolved "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.11.1.tgz"
@@ -4183,11 +4144,6 @@ [email protected], execa@^5.0.0:
     signal-exit "^3.0.3"
     strip-final-newline "^2.0.0"
 
-exenv-es6@^1.1.1:
-  version "1.1.1"
-  resolved "https://registry.npmjs.org/exenv-es6/-/exenv-es6-1.1.1.tgz"
-  integrity sha512-vlVu3N8d6yEMpMsEm+7sUBAI81aqYYuEvfK0jNqmdb/OPXzzH7QWDDnVjMvDSY47JdHEqx/dfC/q8WkfoTmpGQ==
-
 exit@^0.1.2:
   version "0.1.2"
   resolved "https://registry.npmjs.org/exit/-/exit-0.1.2.tgz"
@@ -7221,11 +7177,6 @@ [email protected], sync-fetch@^0.4.0:
     buffer "^5.7.1"
     node-fetch "^2.6.1"
 
-tabbable@^5.2.0:
-  version "5.3.3"
-  resolved "https://registry.npmjs.org/tabbable/-/tabbable-5.3.3.tgz"
-  integrity sha512-QD9qKY3StfbZqWOPLp0++pOrAVb/HbUi5xCc8cUo4XjP19808oaMiDzn0leBY5mCespIBM0CIZePzZjgzR83kA==
-
 tapable@^2.1.1, tapable@^2.2.0:
   version "2.2.1"
   resolved "https://registry.npmjs.org/tapable/-/tapable-2.2.1.tgz"
@@ -7432,11 +7383,6 @@ tsconfig-paths@^3.14.1:
     minimist "^1.2.6"
     strip-bom "^3.0.0"
 
-tslib@^1.13.0:
-  version "1.14.1"
-  resolved "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz"
-  integrity sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==
-
 tslib@^2, tslib@^2.0.3, tslib@^2.1.0, tslib@^2.4.0, tslib@~2.4.0:
   version "2.4.0"
   resolved "https://registry.npmjs.org/tslib/-/tslib-2.4.0.tgz"