Add feature flag for Chem/Hem data retrieval and update filtering logic

[acrollet]

Summary

• This work is behind a feature toggle (flipper): YES

This is a follow-on to #20975

• adds feature toggle for enablement of Chemistry/Hematology records

Related issue(s)

• Add labs and tests to VAHB va-mobile-app#10405

Testing done

• New code is covered by unit tests

What areas of the site does it impact?

• Does not impact existing functionality

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature