[Chore] Add avatar astral flows and other missing mobskill copies to mobskill enum file

[Xaver-DaRed]

I affirm:

• [x] I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• [x] I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• [x] I have read and understood the Contributing Guide and the Code of Conduct.
• [x] I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

A little extra work I made while reviewing PR #6360

That PR doesnt need any extra work, right now. But may need revisiting.

Steps to test these changes

None.

[TracentEden2]

Looking good, I do know that 839 (Howling Moon) is used by Fenrir in Moonlit Path (see capture here). I will make a PR to make Fenrir more retail accurate at some point.