Encapsulate all mutable CSP filter settings in a single object

[labkey-adam]

Rationale

No functional change, this merely groups four per-CSP-filter settings into a single CspSettings object to encapsulate the logic around these settings and set them atomically. This reduces the synchronization required and prevents other threads from seeing a mix of old and new values.

Related Pull Requests

• Support report-to CSP directive and Reporting-Endpoints header (#7374) #7380

Tasks 📍

• Manual Testing
  • Switch base server URL from http: to https: and back
  • Add and remove allowed external resource hosts
  • Turn the "Disable enforce Content Security Policy" experimental feature on and off
  • After each transition, ensure that the CSP and Reporting-Endpoints are as expected. No exceptions or errors in the log.

[labkey-jeckels]

I didn't have time to test yet.