Integrate gitlab-ci/remove-parsing-of-testdata-in-package and 3 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@45f2aca7

Refactoring: remove parsing of testdata.json in package stage

Extract and save these variables in the build stage instead and
explicitly pass them as arguments to the package script.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@8ca2487d

Move .simulate_build below .build_yocto

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@2808f067

Fix build.env contents for simulated build

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@73d00715

Pretty print release metadata JSON file