Enable description editing for imported clusters

[codyrancher]

Summary

Enable description editing for imported clusters. Closer to an enhancement than a bug.

Fixes #15358

Areas or cases that should be tested

Imported cluster creation/editing.

Areas which could experience regressions

Imported cluster creation/editing.

Screenshot/Video

description.mp4

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes
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• The PR has considered, and if applicable tested with, the three Global Roles Admin, Standard User and User Base

[momesgin]

tested and lgtm