feat(form-core): Add options to reset/replace all fields [FieldGroupApi]

[kusiewicz]

🎯 Changes

Regarding: #1684

This PR adds functionalities to the Field Group API:

resetAllFields - reset all group fields to their default values
deleteAllFields - delete all fields from the current group instance
replaceAllFields - replace all group fields with new provided values

When accepted, I will prepare documentation update.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 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: 2149a92

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---

☁️ Nx Cloud last updated this comment at 2025-12-30 17:26:13 UTC

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commit: 2149a92

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.13%. Comparing base (6892ed0) to head (2149a92).
⚠️ Report is 111 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/form-core/src/FieldGroupApi.ts	62.50%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1962      +/-   ##
==========================================
- Coverage   90.35%   89.13%   -1.23%     
==========================================
  Files          38       48      +10     
  Lines        1752     1969     +217     
  Branches      444      492      +48     
==========================================
+ Hits         1583     1755     +172     
- Misses        149      191      +42     
- Partials       20       23       +3     

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