Hide rotation restriction when rotation length is hourly

What does this MR do?

On call rotations can have a time restriction that limits them to certain hours in a day.

This restriction doesn't make sense for rotation of less than a day. So we hide that section of the form when the rotation length is 'hourly'.

issue: #262859 (closed)

discussion: #262859 (comment 500826685)

Follow-ups (Deferred because they will conflict with other in-flight MRs)

• Refactor form to use new updateRotationForm method.
• Refactor form specs to use trigger instead of $emit.

Testing notes

• Feature flag :oncall_schedules_mvc
• Requires a GitLab Premium license or higher

Screenshots (strongly suggested)

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