[CNFT1-3307] event search feature flag

[adamloup-enquizit]

Description

Adds configurable front-end feature flags for searches;

Name	Default	Description
nbs.ui.features.search.events.enabled	true	Enables access to NBS6 Event Search
nbs.ui.features.search.investigations.enabled	false	Enables access to modernized Investigation search
nbs.ui.features.search.laboratoryReports.enabled	false	Enables access to modernized Laboratory search

Removed redundant configuration tests that were in modernization-api.

These configurations will be settable at deployment with changes made to the Helm charts.

Tickets

• CNFT1-3307

Checklist before requesting a review

• PR focuses on a single story
• Code has been fully tested to meet acceptance criteria
• PR is reasonably small and reviewable (Generally less than 10 files and 500 changed lines)
• All new functions/classes/components reasonably small
• Functions/classes/components focused on one responsibility
• Code easy to understand and modify (clarity over concise/clever)
• PRs containing TypeScript follow the Do's and Don'ts
• PR does not contain hardcoded values (Uses constants)
• All code is covered by unit or feature tests

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud