[19.0] [IMP] storage: Remove dependency on server_environment

[yankinmax]

This is a forward-port of:

• [18.0] [IMP] storage: Remove dependency on server_environment #655

[OCA-git-bot]

Hi @lmignon,
some modules you are maintaining are being modified, check this out!

[yankinmax]

Hello @etobella @lmignon @ivantodorovich
In this PR I've cherry-picked the commits from 18.0 PR:

• [18.0] [IMP] storage: Remove dependency on server_environment #655
  As only few modules are migrated I've splitted only them.
  image_tag split is handled separately, because it doesn't introduce any server_env_fields override, so only need the upgrade script:
• [19.0][ADD] image_tag_environment: make server_environment an optional dependency #583