feat: add Cypress e2e tests for dashboard push actions

[fabiovincenzi]

Fixes #1390

• Add Cypress e2e tests for the admin UI dashboard's push management flows (approve, reject, cancel)
• Fix disabled prop not being forwarded in CustomButton component, which prevented the attestation confirm button from being properly disabled
• Add data-testid attributes to push detail action buttons and attestation dialog for reliable test selectors
• Organise Cypress tests into cypress/e2e/ (local) and cypress/e2e/docker/ (require Docker); local tests continue to run in the Node/MongoDB matrix in ci.yml, Docker tests run in e2e.yml
• Add cypress:run:docker script targeting Docker-only tests
• Add Cypress Docker step to e2e.yml alongside existing vitest e2e tests, with log dump and screenshot upload on failure
• Make existing Cypress tests (repo.cy.js) compatible with Docker environment by replacing hardcoded URLs with Cypress.env('API_BASE_URL')
• Pass git credentials via GIT_CONFIG_* env vars in createPush to avoid exposing them in CI logs

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🔨 Latest commit	308d747
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.01%. Comparing base (ac353de) to head (308d747).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1403   +/-   ##
=======================================
  Coverage   90.01%   90.01%           
=======================================
  Files          67       67           
  Lines        4769     4769           
  Branches      885      885           
=======================================
  Hits         4293     4293           
  Misses        458      458           
  Partials       18       18           

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[jescalada]

Looks good so far!

[jescalada]

@dcoric This might be relevant to your error handling PR #1406 - in case you get failing tests after this gets merged!

[jescalada]

I'm having some issues with tests failing locally due to Cypress checking the first page which is full of repositories from previous test executions:

It'd be great to have some cleanup for repositories specifically, although general cleanup functions for everything affecting the local DB would be ideal!

[fabiovincenzi]

Added a cleanupTestRepos command that deletes all cypress-test repos from the DB before the suite runs,. Also fixed a pre-existing bug in the "Existing repo" after hook that was using repo.name instead of repo._id for the delete request, which silently prevented cleanup from working.