Make create-release-pr aware of ABS setting .replace-app-version-with-git and update Chart.yaml accordingly

[uvegla]

In GiantSwarm project that are not wrapping third party projects, we want the .appVersion in Chart.yaml files to match the application version, that matches the Chart version. For such projects we think of the 2 things as one and its misleading to not keep this updated in the repo as well. The Helm artifact will have it correctly, cos ABS updates at build time, but this GitHub workflow is responsible to commit it on the PR.

Since this is totally separate from ABS, this is a best effort implementation to check if the project uses ABS and if the .replace-app-version-with-git setting is enabled. If so, update that too in the Chart.yaml for the release PR.

Tests:

• without this: https://github.com/giantswarm/app-operator/pull/1519/changes
• with this: https://github.com/giantswarm/app-operator/pull/1518/changes
• a non ABS project still works: https://github.com/giantswarm/apptest/pull/453/changes