Enable Incremental Loading, Manual Refresh and SSP at same time, make FF sole switch for SSP

[richard-cox]

Summary

Fixes #14016
Fixes #14087

Contributes to #14034

Occurred changes and/or fixed issues

• Allow SSP, incremental loading and manual refresh performance settings to be enabled at the same time
  • If a list has SSP enabled it will disable incremental loading and manual refresh features
• Enable SSP only via Feature Flag (remove SSP enabled/disabled performance setting)
  • Given the backend and frontend changes are so co-dependent now it makes sense to remove this additional step
  • The only thing blocking it was the disabling of incremental loading and manual refresh perf settings which happened when user enabled SSP perf setting. That's no longer required

Technical notes summary

Areas or cases that should be tested

• Vai off
  • incremental loading and manual refresh perf settings enabled
    • general feature tests
• Vai on
  • incremental loading and manual refresh perf settings enabled
    • list that is not supported by SSP (fleet, cluster management, etc or hack the pods view) should have both features working
    • list that is supported by SSP (pod) should have both features NOT working (aka not exercised)
      • manual refresh is odd.. because SSP has it's own manual refresh option
  • incremental loading and manual refresh perf settings disabled
    • lists that are supported and not supported by SSP continue to work as required

Areas which could experience regressions

• Lists
• Performance Settings View

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
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• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes