Move to Runtime Platform Flags

[fao89]

Jira: https://issues.redhat.com/browse/AAP-45879

This PR moves the EDA feature flag source from Settings based feature flags, to platform database level feature flags.
This also makes gateway the provider of this data for the platform.

This is required to enable platform level feature flags.

Gateway is the provider of the feature flag value updates, and is resource synced to EDA/other components.

It can be validated and tested simply with AAP Dev, and requires the following DAB PR to be merged in beforehand -
ansible/django-ansible-base#875
Once the DAB PR is merged, I will update this PR to point back to the upstream devel branch of DAB

To test -

1. Clone AAP-Dev
2. make configure-sources
3. Select DAB, GW, and EDA for sources
4. make aap
5. Attempt to hit <GATEWAY_API>/feature_flags/X api endpoint and patch a flags value.
6. If Gateway Setting RUNTIME_FEATURE_FLAGS == True, the update succeeds and flag value is resource synced to EDA
7. If Gateway Setting RUNTIME_FEATURE_FLAGS == False, the update fails with error explaining why.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.61%. Comparing base (9b7196a) to head (e7af0de).

@@           Coverage Diff           @@
##             main    #1407   +/-   ##
=======================================
  Coverage   94.60%   94.61%           
=======================================
  Files         343      343           
  Lines       21111    21127   +16     
=======================================
+ Hits        19973    19989   +16     
  Misses       1138     1138           

Flag	Coverage Δ
unit-int-tests-3.11	94.56% <100.00%> (+<0.01%)	⬆️
unit-int-tests-3.12	94.61% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/aap_eda/api/resource_api.py	100.00% <100.00%> (ø)
src/aap_eda/settings/core.py	100.00% <ø> (ø)
src/aap_eda/settings/default.py	100.00% <ø> (ø)
tests/conftest.py	100.00% <100.00%> (ø)
tests/integration/api/test_feature_flags.py	100.00% <100.00%> (ø)
tests/integration/api/test_root.py	100.00% <ø> (ø)
tests/unit/test_features.py	100.00% <100.00%> (ø)

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[fao89]

@ptoscano I see that you pushed a commit, was it for updating the branch? If so, I can rebase to see if I get a green CI

[ptoscano]

@ptoscano I see that you pushed a commit, was it for updating the branch? If so, I can rebase to see if I get a green CI

Yes, it was only a plain rebase, mostly to test recent changes to the coverage reporting for PRs to SonarQube. Apologies that I used it as guinea pig :D

Since the DAB branch it points to is gone (I guess because it was merged?), maybe would you please make it build again? No pressure/hurry. Thanks!