refactor: remove global network from transaction controller

[matthewwalsh0]

Remove multichain flag.
Remove getCurrentChainId usage in background.

Description

Related issues

Fixes:

Manual testing steps

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Screenshots/Recordings

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After

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• I've completed the PR template to the best of my ability
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Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher

🚮 Removed packages: npm/@metamask/[email protected], npm/@metamask/[email protected]

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[metamaskbot]

Builds ready [cafd321]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1826 ± 57 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	386	2142	1765	343	165
		domContentLoaded	1591	2126	1797	114	55
		load	1609	2142	1826	119	57
		domInteractive	17	104	47	22	10
		backgroundConnect	9	68	31	19	9
		firstReactRender	55	117	96	14	7
		getState	5	53	12	10	5
		initialActions	0	0	0	0	0
		loadScripts	1153	1532	1328	95	46
		setupStore	6	59	17	20	9
		uiStartup	1788	2350	2039	127	61

Bundle size diffs [🚀 Bundle size reduced!]

• background: -241 Bytes (-0.00%)
• ui: 0 Bytes (0.00%)
• common: -2.73 KiB (-0.03%)