Integrate gitlab-ci/yocto_ng_porting and 2 more

Commit: https://git.seco.com/yocto_ng/infrastructure/gitlab-ci/-/commit/1437fcc9a05a886916cd637f5ff327ac01b7f324

Comment out jobs executed on ci-test

• The jobs will be uncommented in the next future for testing purpose

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Commit: https://git.seco.com/yocto_ng/infrastructure/gitlab-ci/-/commit/35a25c2700e63d000f6aa6e74d4f200f29f4b836

Bug fix on integrate-ci-test

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Commit: https://git.seco.com/yocto_ng/infrastructure/gitlab-ci/-/commit/d7589278f32d87e3ebbeb01dbd2bceffa2c37276

Porting of CI/CD scripts for compatib. with yocto_ng

• Update README.md and files in the doc folder to fit the new version of CI/CD config files
• Update variables in common file to fit the newly created Docker images
• Insert C31 board build and deploy jobs
• Remove files used in previous integration tests