Add test for and support for copying metadata fields.

[rtibbles]

Summary

Description of the change(s) you made

• Adds test for copying metadata fields
• Adds copying behaviour to copy metadata fields

Manual verification steps performed

1. Add metadata to a node
2. Copied the node
3. Verified that the copy had the fields

Screenshots (if applicable)

Original:

Copy:

Reviewer guidance

How can a reviewer test these changes?

Note: I was unable to replicate either in tests or in the UI the issue of tags not copying.

References

Fixes #3525

[bjester]

@rtibbles Allan and I tested this and noticed that suggested_duration is still not being copied

[rtibbles]

True! I didn't add that, as it wasn't in the original report, I should have though!

[bjester]

@AllanOXDi and I approve!