Remove hardcoding of private connectivity in tests

[sm745052]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request introduces a more flexible way to configure private connectivity for Datastream integration tests. By replacing hardcoded connectivity strings with a system property-driven approach, the tests become more adaptable to different environment configurations without requiring code changes.

Highlights

• Configuration Parameterization: Added a new method getPrivateConnectivity() to TemplateTestBase to allow dynamic configuration of private connectivity via system properties.
• Test Refactoring: Updated numerous integration tests across Datastream-to-BigQuery, Datastream-to-Spanner, and Datastream-to-SQL modules to utilize the new getPrivateConnectivity() method instead of a hardcoded string.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 52.52%. Comparing base (25dd6a0) to head (a31deb6).
⚠️ Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
.../java/org/apache/beam/it/gcp/TemplateTestBase.java	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3668      +/-   ##
============================================
+ Coverage     52.34%   52.52%   +0.17%     
- Complexity     6141     6223      +82     
============================================
  Files          1053     1060       +7     
  Lines         63361    64072     +711     
  Branches       6947     7070     +123     
============================================
+ Hits          33166    33653     +487     
- Misses        27949    28137     +188     
- Partials       2246     2282      +36     

Components	Coverage Δ
spanner-templates	72.30% <ø> (+0.14%)	⬆️
spanner-import-export	68.76% <ø> (-0.16%)	⬇️
spanner-live-forward-migration	80.87% <ø> (+0.49%)	⬆️
spanner-live-reverse-replication	78.23% <ø> (+0.39%)	⬆️
spanner-bulk-migration	89.32% <ø> (+0.13%)	⬆️
gcs-spanner-dv	85.75% <ø> (+0.40%)	⬆️

Files with missing lines	Coverage Δ
.../java/org/apache/beam/it/gcp/TemplateTestBase.java	0.00% <0.00%> (ø)

... and 31 files with indirect coverage changes

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