Integrate gitlab-ci/fix_syntax and 2 more

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@e207c443

gitlab-ci: Disable sourcery

The sourcery plugin fails again due to a missing login. Disable it for
now.

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@a3d1e77c

manifest:integration: Fix issue in trigger/include

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Commit: seco-ne/yocto/infrastructure/gitlab-ci@b6e66192

pipelines:build: Add check to JSON generation

Without the check, we have a race condition when building from sources
outside of the Yocto group.