Integrate gitlab-ci/ssh_to_http_migration and 3 more

Commit: edgehog/infrastructure/gitlab-ci@dea28bc7

[FIX] Fix on git URL config for https

--

Commit: edgehog/infrastructure/gitlab-ci@99694446

[SUBMODULE] Remove submod integration in ARM group

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

--

Commit: edgehog/infrastructure/gitlab-ci@264671ec

[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

--

Commit: edgehog/infrastructure/gitlab-ci@eebd1a22

[HTTPS] Insert git config command for https links

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