Integrate gitlab-ci/fix_integration_name and 3 more

Commit: https://gitlab.com/SECO-Northern-Europe/yocto/infrastructure/gitlab-ci/-/commit/5847145fb42f00483a265f66c875e3066e4d4547

Change integration project name to lower case

The project name is matched with the predefined gitlab var CI_PROJECT_NAME, which uses lower case.

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Commit: https://gitlab.com/SECO-Northern-Europe/yocto/infrastructure/gitlab-ci/-/commit/67f2fcae0c038ec5d1b1e92c2741bded89bc6333

yamllint: Add yamllint job to CI, add yamllint config

Add .yamllint.yml to configure the yamllint usage, should be used as master yamllint config from other stages also. Apply small changes to yml files to match yamllint.

BCS 746-000640

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Commit: https://gitlab.com/SECO-Northern-Europe/yocto/infrastructure/gitlab-ci/-/commit/74643665ec113143bd46378601a733b81580b078

alphaplan_fwr: Create u-boot package from imx-boot.tar.gz if found

The main install file for u-boot changed to imx-boot.tar.gz, so this should be added to alphaplan. Leaving the imx-boot implementation as fallback.

BCS 746-000600

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Commit: https://gitlab.com/SECO-Northern-Europe/yocto/infrastructure/gitlab-ci/-/commit/3514dffbb5a919c75034f2aaf1c4b133316b3503

alphaplan_fwr.py: Silently ignore if 'output_dir is not set