98828 Add feature toggle for RUM - form 10-10d

[michaelclement]

Summary

This PR adds a feature toggle to control the Data Dog Real User Monitoring (RUM) for form 10-10d.

Related issue(s)

• Monitoring: RUM dashboard setup va.gov-team#98828
• 98828 Add initial RUM implementation - form 10-10d vets-website#33772

Testing done

• New code is covered by unit tests
• Describe what the old behavior was prior to the change
• Describe the steps required to verify your changes are working as expected. Exclusively stating 'Specs run' is NOT acceptable as appropriate testing
• If this work is behind a flipper:
  • Tests need to be written for both the flipper on and flipper off scenarios. Docs.
  • What is the testing plan for rolling out the feature?

Screenshots

NA

What areas of the site does it impact?

IVC CHAMPVA form 10-10d only

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

Requested Feedback

NA