chore: pick update headless svc labels for the prometheus scrape job to release-0.9 (#8088)

[sophon-zt]

(cherry picked from commit b019f2c)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.13%. Comparing base (ebe0a4a) to head (4330644).
Report is 3 commits behind head on release-0.9.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.9    #8098      +/-   ##
===============================================
- Coverage        65.18%   65.13%   -0.06%     
===============================================
  Files              357      357              
  Lines            44754    44755       +1     
===============================================
- Hits             29174    29150      -24     
- Misses           12992    13005      +13     
- Partials          2588     2600      +12     

Flag	Coverage Δ
unittests	65.13% <100.00%> (-0.06%)	⬇️

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[sophon-zt]

/approve