Fix flaky SQL statistics test

[apurvabhaleMS]

Description

Fixes an intermittent failure in GivenMissingTrueSearchForPatientByGender_NotExistsStatsAreCreated.

The SQL search statistics cache is process-wide and may already contain valid individual-gender statistics for non-Patient resource types created by other test classes. The test now snapshots the cache before executing the Patient gender:missing=true search and scopes its negative assertion to newly added statistics. The positive assertion still verifies that the expected Patient statistic exists after the search.

Related issues

Addresses AB205695

Testing

Result: 1 passed, 0 failed.

FHIR Team Checklist

• Update the title of the PR to be succinct and less than 65 characters
• Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
• Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
• Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
• Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
• When changing or adding behavior, if your code modifies the system design or changes design assumptions, please create and include an ADR.
• CI is green before merge
• Review squash-merge requirements

Semver Change (docs)

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[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.81%. Comparing base (53e30b0) to head (d1433df).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5769      +/-   ##
==========================================
+ Coverage   78.79%   78.81%   +0.02%     
==========================================
  Files        1020     1020              
  Lines       37783    37783              
  Branches     5754     5754              
==========================================
+ Hits        29772    29780       +8     
+ Misses       6594     6582      -12     
- Partials     1417     1421       +4     

see 6 files with indirect coverage changes

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