test(Spanner): Reverse: implement comprehensive Spanner-to-SQLServer integration test suite and update source connector logic

[pratickchokhani]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 82.42574% with 142 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.42%. Comparing base (9f87f58) to head (9546820).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...plates/source/sqlserver/SQLServerDMLGenerator.java	64.80%	39 Missing and 24 partials ⚠️
...rce/sqlserver/SQLServerSpToSrcSourceConnector.java	39.28%	34 Missing ⚠️
...lectadapter/sqlserver/SqlServerDialectAdapter.java	91.42%	6 Missing and 12 partials ⚠️
...er/migrations/connection/JdbcConnectionHelper.java	44.00%	10 Missing and 4 partials ⚠️
...eport/v2/templates/transforms/AssignShardIdFn.java	0.00%	6 Missing ⚠️
...rowmapper/provider/SqlServerJdbcValueMappings.java	97.16%	1 Missing and 2 partials ⚠️
.../v2/spanner/migrations/avro/AvroToValueMapper.java	97.29%	1 Missing and 1 partial ⚠️
...rce/sqlserver/SqlServerSrcToSpSourceConnector.java	98.86%	0 Missing and 1 partial ⚠️
...r/sourceddl/SQLServerInformationSchemaScanner.java	97.82%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #4212       +/-   ##
=============================================
+ Coverage     33.92%   63.42%   +29.50%     
- Complexity      505     2933     +2428     
=============================================
  Files           215      570      +355     
  Lines         13148    33577    +20429     
  Branches       1308     3787     +2479     
=============================================
+ Hits           4460    21297    +16837     
- Misses         8321    11188     +2867     
- Partials        367     1092      +725     

Components	Coverage Δ
spanner-templates	84.13% <82.42%> (∅)
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	88.67% <88.43%> (∅)
spanner-live-reverse-replication	79.88% <69.15%> (∅)
spanner-bulk-migration	89.26% <93.10%> (∅)
gcs-spanner-dv	88.01% <88.43%> (∅)

Files with missing lines	Coverage Δ
...v2/reader/io/jdbc/iowrapper/config/SQLDialect.java	100.00% <100.00%> (ø)
...oud/teleport/v2/source/SourceConnectorFactory.java	100.00% <100.00%> (ø)
...apper/config/defaults/SqlServerConfigDefaults.java	100.00% <100.00%> (ø)
...ort/v2/spanner/migrations/constants/Constants.java	0.00% <ø> (ø)
...r/migrations/source/config/SourceConfigParser.java	79.54% <ø> (ø)
...2/spanner/migrations/source/config/SourceType.java	100.00% <100.00%> (ø)
...ates/dbutils/processor/SourceProcessorFactory.java	96.29% <100.00%> (ø)
...rce/sqlserver/SqlServerSrcToSpSourceConnector.java	98.86% <98.86%> (ø)
...r/sourceddl/SQLServerInformationSchemaScanner.java	97.82% <97.82%> (ø)
.../v2/spanner/migrations/avro/AvroToValueMapper.java	95.34% <97.29%> (ø)
... and 6 more

... and 435 files with indirect coverage changes

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