[Vue] migrate ajax-form directive to vue #18443

Description:

This PR is based off of #18442.

• Migrate piwik-ajax-form directive to a vue component. Since this directive shared the scope w/ the transcluded children, the adapter was written specifically for it.

Review

• [ ] Functional review done
• [ ] Potential edge cases thought about (behavior of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done
• [ ] Wording review done
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

UI tests should be passing for this PR

This issue is in "needs review" but there has been no activity for 7 days. ping @matomo-org/core-reviewers

This issue is in "needs review" but there has been no activity for 7 days. ping @matomo-org/core-reviewers

tested via loginldap settings page which uses ajax-form (only other use is in LoginSaml I believe)