feat(W-23159740): use per-user UA string in SFHybridViewController

[wmathurin]

Summary

• SFHybridViewController.m: passes currentUser to userAgentString:qualifier:forUser: so per-user feature flags are included in the hybrid WebView User-Agent string

GUS Stories

• W-23159740 (iOS per-user feature flags)
• W-21167151 (spike)

Dependencies

• Requires PR feat(W-23159740): per-user persistent feature flags (iOS) SalesforceMobileSDK-iOS#4086

Test plan

• Code review — single-method simplification
• Integration tests (require sandbox credentials — run in CI)

[github-actions]

	Tests	Passed ✅	Skipped	Failed
SalesforceFileLogger iOS ^26 Test Results	15 ran	15 ✅

Test	Result
No test annotations available

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.51%. Comparing base (aeb58bd) to head (95e2382).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #314      +/-   ##
==========================================
- Coverage   62.62%   62.51%   -0.12%     
==========================================
  Files          21       21              
  Lines        1699     1694       -5     
==========================================
- Hits         1064     1059       -5     
  Misses        635      635              

Flag	Coverage Δ
SalesforceFileLogger	70.55% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...lesforceHybridSDK/Classes/SFHybridViewController.m	40.95% <ø> (-0.93%)	⬇️

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[wmathurin]

NB: Once the iOS PR forcedotcom/SalesforceMobileSDK-iOS#4086 is merged, I will update the submodule here and the tests should build and pass again.