fix(form-core): Fix memory leaks from EventClient

[LeCarbonator]

🎯 Changes

The PR addresses two memory leaks related to the EventClient:

• Unsubscribe from event listeners on cleanup
• Fix queuedEvents from piling up FormApi references

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9f6655e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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View your CI Pipeline Execution ↗ for commit 9f6655e

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	1m 22s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	33s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-11-20 08:52:08 UTC

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commit: 9f6655e

[codecov]

Codecov Report

❌ Patch coverage is 31.81818% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.80%. Comparing base (6892ed0) to head (9f6655e).
⚠️ Report is 56 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/form-core/src/FormApi.ts	31.81%	12 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1866      +/-   ##
==========================================
- Coverage   90.35%   89.80%   -0.56%     
==========================================
  Files          38       41       +3     
  Lines        1752     1853     +101     
  Branches      444      469      +25     
==========================================
+ Hits         1583     1664      +81     
- Misses        149      169      +20     
  Partials       20       20              

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