Add cadence form FE

What does this MR do?

Add more FE for iteration cadences form.

Depends on iteration_cadences feature flag

FE for #322741 (closed)

1. Add HAML and boilerplate - !59216 (merged)
2. Add Vue form [this MR] - !59227 (merged)
3. Add vue router !60725 (merged)
4. Add List page
5. Add Edit page

Both Save (success) and Cancel will go to the Cadences list page. As that isn't added yet it will 404. This is expected until step 3 above

Screenshots (strongly suggested)

default state

filled out

'Automated scheduling' disabled

With errors

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because _____.
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team