Disable $includes for iterative includes

[LTA-Thinking]

Description

$includes never supported iterative includes, but it currently throws a 500 when a search with iterative includes exceeds the max includes count. This change prevents that 500 and returns a warning instead.

Related issues

Addresses Bug 194365

Testing

New E2E test

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)

Patch|Skip|Feature|Breaking (reason)

[mikaelweave]

small comments - newline is moot - text is more important

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@7769ecc). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5620   +/-   ##
=======================================
  Coverage        ?   76.90%           
=======================================
  Files           ?      997           
  Lines           ?    36621           
  Branches        ?     5530           
=======================================
  Hits            ?    28163           
  Misses          ?     7110           
  Partials        ?     1348           

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