Add/project task assigne in task team

[Herafia]

Checklist before requesting a review

Please delete options that are not relevant.

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.
• This change requires a documentation update.

Description

• It fixes !43335
• Adding bulk actions for project task teams
  Allows you to add users, groups, supplier, and contacts to the team of multiple tasks using “Edit” bulk actions.

[stonebuzz]

fonctionnaly OK for me

[trasher]

Please rebase to fix conflicts.
Also, please squash your commits, and use a proper commit message.

Please remember commits messages must be in english, and descriptive.
Of course everyone will use some "fix" commits (or even "fixup! fixup! fixup! fixup! fixup! fixup!" ;p).

When squashing+merge on GH web UI, commit will take PR title, and description of all commits. Most of the time (90%) I cannot rework commit messages - and that's anyway more work re rephrase.

[cedric-anne]

This behaviour does not seems expected, and it makes the code pretty hard to understand, and therefore to maintain.
I think it would be preferable to override the processMassiveActionsForOneItemtype() method to handle this behaviour only in the massive actions context.

changes were made