[Infra] Do not generate shaded jar for common modules

[Abacn]

Fix #2158

skipped shaded jar for common modules that do not contain any @Template

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.89%. Comparing base (208e2ba) to head (ebb3a55).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##               main    #2157    +/-   ##
==========================================
  Coverage     46.88%   46.89%            
- Complexity     4014     4345   +331     
==========================================
  Files           874      874            
  Lines         52042    52070    +28     
  Branches       5454     5461     +7     
==========================================
+ Hits          24402    24419    +17     
- Misses        25901    25906     +5     
- Partials       1739     1745     +6     

Components	Coverage Δ
spanner-templates	68.80% <ø> (-0.02%)	⬇️
spanner-import-export	65.63% <ø> (-0.04%)	⬇️
spanner-live-forward-migration	76.50% <ø> (ø)
spanner-live-reverse-replication	78.67% <ø> (ø)
spanner-bulk-migration	87.87% <ø> (ø)

see 3 files with indirect coverage changes

[Abacn]

I believe this would largely improve the log spam of release workflow log. Current log for Release workflow is 120 MB and almost half are these logs / another half being #1800

[Abacn]

SpannerChangeStreamsToGcsIT.testSpannerChangeStreamsToGcsAvro[Default]

Caused by: com.google.cloud.spanner.SpannerException: FAILED_PRECONDITION: Operation with name "projects/cloud-teleport-testing/instances/teleport/databases/testspa_20250130_023955_qsbwrw/operations/r2f63ae85_0ee6_422b_ba6e_23130c0b4480" failed with status = GrpcStatusCode{transportCode=FAILED_PRECONDITION} and message = Duplicate name in schema: testSpannerChangeStreamsToGcsAvroDefault.

is a flaky test, not related to this change