Clean up unused OSSRH Sonatype settings

[Abacn]

in response to https://central.sonatype.org/news/20250326_ossrh_sunset/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.59%. Comparing base (dcd6be2) to head (0b619ad).
Report is 9 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2492      +/-   ##
============================================
- Coverage     49.64%   49.59%   -0.05%     
- Complexity     4806     5161     +355     
============================================
  Files           941      941              
  Lines         57683    57712      +29     
  Branches       6233     6235       +2     
============================================
- Hits          28634    28623      -11     
- Misses        27007    27048      +41     
+ Partials       2042     2041       -1     

Components	Coverage Δ
spanner-templates	69.89% <ø> (-0.05%)	⬇️
spanner-import-export	68.50% <ø> (-0.11%)	⬇️
spanner-live-forward-migration	78.77% <ø> (ø)
spanner-live-reverse-replication	77.36% <ø> (ø)
spanner-bulk-migration	87.88% <ø> (-0.01%)	⬇️

see 9 files with indirect coverage changes

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