Declare global PromiseWithResolvers type

[samchungy]

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Description

Declares a global type to allow builds for users who are not using ESNext to pass. This takes a similar approach to other libraries where the DOM lib is not present.

Related #6353

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update

Screenshots/Sandbox (if appropriate/relevant):

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action on it as appropriate

How Has This Been Tested?

Locally editing the node module with the global

Test Environment:

• NodeJS: 20

Checklist:

• I have followed the
  CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
  ^ Not sure how. Can confirm it now passes locally
• New and existing unit tests and linter rules pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Further comments

[changeset-bot]

🦋 Changeset detected

Latest commit: 0a76f0e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphql-tools/delegate	Patch

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[acrogenesis]

seeing this error too

yarn build   
yarn run v1.22.22
$ tsc
node_modules/@graphql-tools/delegate/typings/leftOver.d.ts:4:37 - error TS2304: Cannot find name 'PromiseWithResolvers'.

4 export type Deferred<T = unknown> = PromiseWithResolvers<T>;
                                      ~~~~~~~~~~~~~~~~~~~~


Found 1 error in node_modules/@graphql-tools/delegate/typings/leftOver.d.ts:4

error Command failed with exit code 2.

adding the global declaration fixes the build issue.