Add delete route for shared library api

[knolleary]

Description

Adds support for deleting entries from the Shared Team Library

• DELETE /storage/library/:libraryId/:path

Response:

• { "status": "okay", "deleteCount": <how many things were deleted> }

If path matches a single entry (ie a 'file') the file is deleted (deleteCount: 1)
If path matches a folder, all entries beneath that folder are deleted. (deleteCount: n)
If path doesn't match anything, it 404s.

An optional type=<type> parameter can be included to restrict the operation to library entries of a particular type. Whilst this isn't necessarily needed by the UI, it is consistent with the GET api that Node-RED requires to be able to filter by type.

Related Issue(s)

#1597

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• [-] Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• [-] Changes flowforge.yml?
  • Issue/PR raised on flowforge/helm to update ConfigMap Template
  • Issue/PR raised on flowforge/CloudProject to update values for Staging/Production

Labels

• Backport needed? -> add the backport label
• Includes a DB migration? -> add the area:migration label

[joepavitt]

thanks for turning that round so quickly Nick - will review/merge once tests have run

[Pezmc]

I think an extra tests is needed, but otherwise 👍