Integrate gitlab-ci/changelog-generator-all-projects-YT-256 and 3 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@f0ed0f4f

CI: Changelog: Add new variable 'CHANGELOG_PROJECTS_SKIP', remove project list

The listed projects for the changelog are now supposed to be found
automatically. No need to list them anymore.
The 'SKIP' variable is mostly ment for custom projects, to filter out
unneeded projects from the changelog.

YT-256

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@434d542a

get_integration_source: Print warning to stderr instead of stdout

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@5cc674f7

Changelog: Include all related projects into the changelog

In build-pipeline.yml, enable the new parameter by default.

YT-256

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@0c4173a5

Changelog-generator: Add parameter to include all integrated projects

Before this, the changelog was generated on a given list of projects,
all using the same branch.
The new parameter now goes the the specified projects from the
parameters, and detects all integrated projects into this.
So normally you would specify one or two manifest projects, everything
else is automatically added to the list.

This also handles different branch names. As for example the kernel
branches are different, the integration branch is used instead of the
branch from the command line.