Add optional dbname override to MicrosoftSQLServerConnector.build_uri

[adamsachs]

https://ethyca.atlassian.net/browse/ENG-3592

Description Of Changes

The fidesplus MSSQL discovery monitor needs to target a specific database on each scan iteration. Today it duplicates the URL-construction logic from MicrosoftSQLServerConnector.build_uri (in its own create_engine method) because there's no way to parameterize the dbname through the connector. That duplication is how read_only_connection ended up silently ignored by D&D scans — see fidesplus#3459.

This PR adds an optional dbname: Optional[str] = None parameter to MicrosoftSQLServerConnector.build_uri. When provided, it overrides the database name from secrets; otherwise behavior is unchanged. The companion fidesplus PR (stacked on 3459) will swap the monitor's inline URL construction for connector.build_uri(db_name).

Code Changes

• src/fides/api/service/connectors/microsoft_sql_server_connector.py — build_uri now accepts an optional dbname argument; URL.create(..., database=dbname or config.dbname, ...). No other behavior changes.
• tests/ops/service/connection_config/test_microsoft_sql_server_connector.py — New test module covering default behavior, dbname override (including assertion that secrets are not mutated), and read_only_connection routing across enabled/disabled/unset cases (parameterized).

Steps to Confirm

1. Run pytest tests/ops/service/connection_config/test_microsoft_sql_server_connector.py — all 5 tests (1 default + 1 override + 3 read_only param cases) should pass.
2. No behavior change for existing callers: connector.build_uri() without arguments is unchanged.

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • No new entry — tiny method-signature addition; will ship via the paired fidesplus fix entry
• UX feedback:
  • No UX review needed
• Followup issues:
  • No followup issues
• Database migrations:
  • No migrations
• Documentation:
  • No documentation updates required

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Project	Deployment	Actions	Updated (UTC)
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.96%. Comparing base (353115b) to head (2381bcb).
⚠️ Report is 17 commits behind head on main.

❌ Your project status has failed because the head coverage (84.96%) is below the target coverage (85.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8017   +/-   ##
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  Coverage   84.96%   84.96%           
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  Files         632      632           
  Lines       41471    41471           
  Branches     4836     4836           
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+ Hits        35235    35237    +2     
+ Misses       5136     5134    -2     
  Partials     1100     1100           

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