Refactor BulkDeleteController to simplify search parameter checks

[jestradaMS]

Description

This pull request refactors the logic in BulkDeleteController to avoid false-positive conflicts when handling system-wide bulk delete requests during a running reindex job. It removes unnecessary dependencies and simplifies the check for whether a delete request can affect SearchParameter resources. Additionally, a new unit test is added to ensure correct behavior.

Related issues

Addresses AB#191051.

Testing

Describe how this change was tested.

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)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.11%. Comparing base (a894a3b) to head (93d17cd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5538      +/-   ##
==========================================
+ Coverage   77.02%   77.11%   +0.08%     
==========================================
  Files         983      983              
  Lines       36007    36002       -5     
  Branches     5469     5469              
==========================================
+ Hits        27736    27762      +26     
+ Misses       6927     6896      -31     
  Partials     1344     1344              

see 9 files with indirect coverage changes

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