Migrate from Travis CI to Github Actions to run our CI

[mattab]

as per title

work done in #18679

Steps

• Update Global action to deal with Missing dependencies in some builds
• Update console command to generate the file. So that it's easy to update the Travis files. So you can create github action file by using a command. so it's easy to push the github actions to all available plugins without manually coping the github action files
• check if Github builds at least as fast as travis? and report the runtime here to compare
• we make it work for Matomo core
  • and also for the other repositories under the team
  • and we provide basic instructions to colleagues on how to convert a plugin repo to github
• Update the guides that mention Travis to replace with Github and fix appropriately -> Delete any outdated content and write a very basic guide on how Github works
  • https://developer.matomo.org/guides/tests-travis-extended
  • https://developer.matomo.org/guides/tests-travis
• Document how to handle dependencies in a plugin
  • eg. how would it work for LDAP plugin for example "LoginLdap, for example, tests itself against a live LDAP server and thus needs to install and setup OpenLDAP on travis. To accomplish this, LoginLdap adds extra steps to its generated .travis.yml file." -> how would we do this on github action? Yes, with a local action it's possible.

Notes:

• we don't fix random failing tests for now
• we do fix any tests that consistently fail

[sgiehl]

GitHub test action is now running for 4.x-dev branch. Travis tests will still run in parallel (except UI tests).
Will create another PR to remove travis tests (including the sumbodule) for 5.x-dev branch. So support for travis ci will be dropped with Matomo 5.