Fleet UI: FMA UI follow-ups for version pinning and patch-policy chip

[RachelElysia]

Issue

Closes #48299

Description

• Edit Software modal (FMAs): Removed the dead PackageVersionSelector dropdown — it was disabled with a now-stale "GitOps only" tooltip. VersionsModal is the single source of truth for version pinning, so the dropdown (and the file-replace pencil, which never applied to FMAs) are gone. Also dropped the now-unused version field from IPackageFormData and the sortByVersionLatestFirst helper.
• Actions ▾ → Versions in gitops mode: No longer disabled with GitOpsModeTooltipWrapper. The VersionsModal itself disables Save in gitops mode, matching the behavior when clicking the in-row Latest/Pinned badge — those two paths are now consistent.
• Summary card chip: When every linked policy is patch-only (no "dynamic" in any policy's type set), the chip now reads "Patch policy" with the policy (shield) icon. "Auto install" with the refresh icon still wins as soon as any policy is dynamic.

Screenrecording

Screen.Recording.2026-06-25.at.4.08.21.PM.mov

Testing

• Added/updated automated tests
• QA'd all new/changed functionality manually

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[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 67.36%. Comparing base (b9f8c1d) to head (55d166d).

Files with missing lines	Patch %	Lines
...ePage/components/forms/PackageForm/PackageForm.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                            Coverage Diff                            @@
##           feat/38504-auto-update-pin-rollback-fma   #48304    +/-   ##
=========================================================================
  Coverage                                    67.35%   67.36%            
=========================================================================
  Files                                         3669     3668     -1     
  Lines                                       232268   232223    -45     
  Branches                                     12266    12399   +133     
=========================================================================
- Hits                                        156447   156432    -15     
+ Misses                                       61820    61790    -30     
  Partials                                     14001    14001            

Flag	Coverage Δ
frontend	59.01% <85.71%> (+0.03%)	⬆️

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