Integrate gitlab-ci/combine-confluence-pages-from-multiple-pipelines and 2 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@c292d144

Confluence: combine data from parallel child pipelines

We deploy Yocto image and SDK in different pipelines, which both have
their Confluence jobs with the same Confluence target. Previously these
pipelines have been independent, so that running the Confluence job in
one of them would overwrite the Confluence page if it has been run in
the other pipeline before. Hence we could either have the image files or
the SDK files in the Confluence page.
Combine these now by checking for other parallel child pipelines with
the same Confluence configuration, so that running the Confluence jobs
in the Yocto pipeline also includes the information from the SDK build
and vice versa.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@53106170

Fix ci-test SDK version

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@d6d4ab61

Fix ci-test SDK download

Since the implementation of multiple child pipelines we cannot use the
previous artifacts download links anymore specifying tag and job name,
because the jobs for image build and SDK build are equal. Use direct
download links instead via job number.