Upgrade Ember.js to version 6.4

[VasylMarchuk]

Closes #3089

Brief

This upgrades Ember.js from version 5.12 to version 6.4

Details

• Sequentially upgraded ember to 6.0.1, ...
• Upgraded ember-math-helpers from 4.0.0 to 5.0.0
• Switched ember-window-mock from our fork to official version 1.0.2
  • We can now remove our fork

Links

• Release announcements: 6.0, 6.1, 6.2, 6.3, 6.4
• Deprecations added in v6: Ember, Ember CLI
• Changes from 5.12 to 6.4
• ember new output diff from 5.12 to 6.4
• The Polaris Edition of Ember
• New authoring format for components
• New embroider build pipeline
• New reactivity system
• Deprecate app-prefix, app-suffix, tests-prefix, and tests-suffix RFC
• ESLint 9 migration guide
• ESLint's new config system

Previous Ember upgrade PRs

• Upgrade to Ember 5 #1161
• Update Ember.js to version 5.8 #2075
• Upgrade Ember.js to version 5.12 #2949

Checklist

• I've thoroughly self-reviewed my changes
• I've added tests for my changes, unless they affect admin-only areas (or are otherwise not worth testing)
• I've verified any visual changes using Percy (add a commit with [percy] in the message to trigger)

[github-actions]

Test Results

  1 files  ±0    1 suites  ±0   9m 21s ⏱️ - 5m 48s
681 tests ±0  630 ✅ +2  51 💤 ±0  0 ❌ ±0 
681 runs  ±0  630 ✅ +4  51 💤 ±0  0 ❌  - 2 

Results for commit 6790322. ± Comparison against base commit 1dac855.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!

[codecov]

Bundle Report

Changes will decrease total bundle size by 363 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
client-array-push	38.82MB	-363 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/chunk.*.js	-1 bytes	11.71kB	-0.01%
assets/chunk.*.js	4 bytes	4.95kB	0.08%
assets/chunk.*.js	-242 bytes	3.34MB	-0.01%
assets/chunk.*.js	-1 bytes	15.26kB	-0.01%
assets/chunk.*.js	-4 bytes	332.34kB	-0.0%
assets/chunk.*.js	-91 bytes	40.76kB	-0.22%
assets/chunk.*.js	-27 bytes	402.29kB	-0.01%
assets/chunk.*.js	-21 bytes	191.3kB	-0.01%
assets/chunk.*.js	-5 bytes	71.61kB	-0.01%
assets/chunk.*.js	-7 bytes	96.04kB	-0.01%
assets/chunk.*.js	-5 bytes	27.68kB	-0.02%
assets/chunk.*.js	37 bytes	64.62kB	0.06%