[DFC-648] - Update existing GA4 feature flags and add tracker flags

[di-aholme]

Proposed changes

What changed

• The feature flags to enable/disable GA4 and UA have been renamed positively, switching from ga4Disabled to ga4Enabled
• Each of the trackers now has its own flag

Why did it change

• The original naming of the global flags was confusing as it reversed the boolean value. Setting it to true meant that the package was turned off
• Now that the package is live, a greater level of control is needed for regressions and bugs to not have a large impact that risks a rollback being required. With these flags, if any trackers start sending PII or experiencing another issue, we can turn that tracker off but continue to collect analytics data

Issue tracking

• DFC-648

Checklists

Environment variables or secrets

• [x] Documented in the README
• [ ] Added to deployment repository
• [ ] Added to local startup repository

Other considerations

• [x] Update README with any new instructions or tasks

[sonarcloud[bot]]

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