Integrate gitlab-ci/ssh_to_http_migration and 3 more

Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/dea28bc7d18e03ecf5f2b3a7331a063f5d5d0096

[FIX] Fix on git URL config for https

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/996944466e2a9c74cf4d1996f396572af7976f5e

[SUBMODULE] Remove submod integration in ARM group

• The removed script was necessary as long as the BSP repositories were in a different group

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/264671ec3d68fa40c43372a1037def02a347149b

[DOC] Update documentation to latest code changes

• Update new stages description in manifest pipeline file
• Update layers integration description in a different file
• Update images
• Remove unused yaml files

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Commit: https://git.seco.com/edgehog/infrastructure/gitlab-ci/-/commit/eebd1a228b429bab3f89761e2c981590269d1123

[HTTPS] Insert git config command for https links

• The command is necessary as long as all Edgehog repositories are private