[DatastreamToSpanner, SpannerToSourceDb, SourceDbToSpanner] Remove hardcoded VPC parameters from integration tests

[darshan-sj]

A separate VPC network is not required now since we disable public ips for the worker machines. We don't run into public ip address quota issue.

[gemini-code-assist]

Summary of Changes

Hello @darshan-sj, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the integration test setup for DatastreamToSpanner and SpannerToSourceDb templates by removing explicit VPC network configurations. This change is feasible because disabling public IPs for worker machines has eliminated the previous public IP address quota issues, making a dedicated VPC network unnecessary for these tests and simplifying their execution.

Highlights

• Test Configuration Simplification: Removed hardcoded VPC network parameters (VPC name, region, and subnetwork) from base integration test classes for DatastreamToSpanner and SpannerToSourceDb templates.
• Integration Test Updates: Updated numerous integration test classes to no longer pass explicit 'network', 'subnetwork', and 'workerRegion' parameters to job configurations, aligning with the removal of hardcoded VPC details.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.80%. Comparing base (5de840a) to head (e67f9b7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3179      +/-   ##
============================================
- Coverage     50.80%   50.80%   -0.01%     
- Complexity     5118     5495     +377     
============================================
  Files           976      976              
  Lines         59996    59996              
  Branches       6555     6555              
============================================
- Hits          30482    30481       -1     
  Misses        27377    27377              
- Partials       2137     2138       +1     

Components	Coverage Δ
spanner-templates	71.00% <ø> (-0.01%)	⬇️
spanner-import-export	68.98% <ø> (-0.02%)	⬇️
spanner-live-forward-migration	80.03% <ø> (ø)
spanner-live-reverse-replication	77.74% <ø> (ø)
spanner-bulk-migration	88.48% <ø> (ø)
see 1 file with indirect coverage changes

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