Prepare Release - Githubissues

This PR is a preview of the release that release-plan has prepared. To release you should just merge this PR 👍

Release (2024-12-02)

@ember/test-waiters 4.0.0 (major)

@ember/test-waiters
- #500 Drop support for ember-concurrency@v2 (ember-concurrency is on @v4 now anyway) (@NullVoxPopuli)
- #477 Drop support legacy waiter system (@NullVoxPopuli)
- #475 Drop support for the 'global' global. Every supported environment has globalThis (@NullVoxPopuli)
- #454 Remove dual-package emit (@NullVoxPopuli)
@ember/test-waiters, base-tests, ember-fetch-v8
- #463 move tests to base-tests app, drop support for 3.8, 3.12, 0.x embroider, and ember-classic (@NullVoxPopuli)
Other
- #453 Require ember-auto-import@v2 (@NullVoxPopuli)
- #455 Upgrade CI / re-roll lockfile (@NullVoxPopuli)

@ember/test-waiters, base-tests
- #508 Remove @glimmer/env in favor of @embroider/macros (@NullVoxPopuli)
@ember/test-waiters
- #474 Drop support for Typescript < 4.9 (@NullVoxPopuli)
- #459 Improve waitFor() types (@bendemboski)
base-tests
- #466 Add support for 3.28, 4.12, 5.4 (@NullVoxPopuli)

Other
- #510 Move LICENSE and README to repo root (@NullVoxPopuli)
- #505 Update release-plan (@NullVoxPopuli)
- #503 Upgrade pnpm (v9) (@NullVoxPopuli)
- #472 Remove extraneous test-app (for ember-concurrency@v3) (@NullVoxPopuli)
- #469 Enable manual CI running (@NullVoxPopuli)
- #456 Remove IE11 from targets as the browser is not supported anymore (@NullVoxPopuli)
base-tests
- #509 Expand try-matrix to expected current support (keeping 3.16+) (@NullVoxPopuli)
@ember/test-waiters, base-tests, ember-fetch-v8
- #507 Update build dependencies (@NullVoxPopuli)
- #506 Update lint dependencies (@NullVoxPopuli)
- #483 Setup formatting enforcement (@NullVoxPopuli)
- #482 Setup local volta configs (@NullVoxPopuli)
- #473 Drop support for TS < v5 -- Setup CI for type-checking all test apps (@NullVoxPopuli)
- #464 Move ember-concurrency-specific-tests to the ember-concurrency@v2 test-app (@NullVoxPopuli)
base-tests, ember-fetch-v8
- #504 Remove stylelint (@NullVoxPopuli)
- #478 Remove ember-data from dev-dependencies (@NullVoxPopuli)
- #479 Test against embroider (@NullVoxPopuli)
- #460 Add 4 empty test apps (all boilerplate) (@NullVoxPopuli)
ember-fetch-v8
- #471 Add test to prove ember-fetch@8 works with the current test-waiter system/integration (@NullVoxPopuli)
@ember/test-waiters
- #468 Setup release plan (@NullVoxPopuli)
- #452 v2 Addon prep: move everything in to a single package monorepo (@NullVoxPopuli)