test: add pgpool test environment

[matthewelwell]

Changes

The purpose of this PR is to add a new workflow that allows us to trigger E2E tests against an arbitrary Flagsmith API running on a public URL.

How did you test this code?

Added a push trigger temporarily and the default values, see result here.

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Nov 21, 2024 6:52pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Nov 21, 2024 6:52pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Nov 21, 2024 6:52pm

[github-actions]

Uffizzi Preview deployment-57361 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.35%. Comparing base (86ba762) to head (ee55ffc).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4747      +/-   ##
==========================================
- Coverage   97.35%   97.35%   -0.01%     
==========================================
  Files        1183     1181       -2     
  Lines       41306    41275      -31     
==========================================
- Hits        40213    40182      -31     
  Misses       1093     1093              

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4747	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4747	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4747	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4747	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4747	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4747	Finished ✅	Results ✅