Add end point to delete field level tags.

[davidsharp7]

Problem

Currently we can add tags at a dataset field level but cannot delete them.

Closes: #2703

Solution

Add DELETE end point for dataset field tags and remove data references from

dataset_fields_tag_mapping
dataset_versions

One-line summary:

Add delete end point to remove dataset field tags.

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've included a one-line summary of your change for the CHANGELOG.md (Depending on the change, this may not be necessary).
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[netlify]

✅ Deploy Preview for peppy-sprite-186812 canceled.

Name	Link
🔨 Latest commit	c7556b3
🔍 Latest deploy log	https://app.netlify.com/sites/peppy-sprite-186812/deploys/6583e198ab1c410008a176e5

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ba1cb33) 84.34% compared to head (c7556b3) 84.42%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2705      +/-   ##
============================================
+ Coverage     84.34%   84.42%   +0.07%     
- Complexity     1414     1416       +2     
============================================
  Files           251      251              
  Lines          6402     6434      +32     
  Branches        291      291              
============================================
+ Hits           5400     5432      +32     
  Misses          850      850              
  Partials        152      152              

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[wslulciuc]

Nice! A much needed API 💯 💯 💯