Rename tags

[jesperhodge]

Description

Implements openedx/modular-learning#259

Find Acceptance Criteria in parent ticket openedx/modular-learning#131 (this covers only the renaming part).

Note that deleting tags is out of scope for this PR.

Includes some updates from the create-tags branch that are not part of this branch.

Note that the renaming should be reflected in courses and modules, but in some instances the search index is not updated. For example, if you go to a library and try to filter by tag inside the library. This is a known issue with its own subticket and does not need to be tested here.

When you submit a duplicate tag, you get a completely messed up error response from the backend. That is a known issue with a subticket and also does not need to be fixed here.

Testing instructions

• Open a taxonomy (if you don't have one, export taxonomy template -> re-import the exported file)
• Find a top level tag that has child elements (you can see that by checking if there's an expand button on the left side). Take note of what the child elements are.
• Go to a course module. Apply the tag.
• Go to another course module. Apply a child tag of this tag but do not apply the tag.
• Go back to the taxonomy and click on the three-dot-menu of the tag.
• click "Rename"
• test renaming: test save and cancel buttons, test escape and enter keyboard buttons
• when an invalid character ";" or ">" is typed, or the tag has empty whitespace, an appropriate error message should appear and save button / Enter should be disabled
• After successful save, a toast should be shown and the renamed tag should appear in the same place
• The renamed tag should keep the child tags that the original tag had
• reload the page
• the renamed tag should now appear alphabetically sorted
• The renamed tag should keep the child tags of the original tag
• Go to the course modules that had the tag applied.
• They should now have the renamed tag applied
• They should have the same child tags applied
• Go back to taxonomy
• Using Chrome dev tools, block the request for renaming a tag (rename a tag -> right click on the network request -> block URL -> keep dev tools open
• Rename another tag, triggering a blocked request
• An appropriate inline error message should be shown
• A banner should be shown indicating that the request failed, with an appropriate error message

[tbain]

Is this a TODO for this effort now, or a later effort?

[jesperhodge]

I think I'll need to leave it for later in the interest of timeliness.

[mgwozdz-unicon]

If we're expecting 4 levels of depth now, should this be updated to include the great grandchild tag as well?

[mgwozdz-unicon]

I think there should be a unit test to check both these cases