fix: merge xRoute/xPolicy statuses across controllers in provider runner

[y-rabie]

Second and last PR split from #7307.
E2e tests depend on changes of #7557 being merged.

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.27%. Comparing base (4af9a89) to head (9769a3c).

Files with missing lines	Patch %	Lines
internal/provider/kubernetes/status.go	33.33%	34 Missing ⚠️

❌ Your patch check has failed because the patch coverage (33.33%) is below the target coverage (60.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7558      +/-   ##
==========================================
- Coverage   72.28%   72.27%   -0.02%     
==========================================
  Files         232      232              
  Lines       34152    34187      +35     
==========================================
+ Hits        24688    24709      +21     
- Misses       7684     7702      +18     
+ Partials     1780     1776       -4     

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