add DELETE end point for dataset tags

[davidsharp7]

Problem

Currently we have no way via the API to a delete a tag from a dataset meaning datasets could potentially be "mis tagged"

Closes: #2692

Solution

Solution is to create a DELETE end point which removes the linkage between the dataset and the tag in

datasets_tag_mapping

One-line summary:

Add DELETE end point for dataset tags.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (033cea3) 84.24% compared to head (f87658e) 84.27%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2698      +/-   ##
============================================
+ Coverage     84.24%   84.27%   +0.03%     
- Complexity     1405     1407       +2     
============================================
  Files           249      249              
  Lines          6371     6386      +15     
  Branches        291      291              
============================================
+ Hits           5367     5382      +15     
  Misses          851      851              
  Partials        153      153              

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[pawel-big-lebowski]

I really like @wslulciuc approach to inregration tests introduced here -> #2700

I know the testing approach is newer than this PR, but the code here seems to be the perfect candidate to write a neat integration test. This will also require implenting tag deleting feature in Marquez client.

[pawel-big-lebowski]

Shouldn't where condition contain namespace filter as well?

[davidsharp7]

I am guessing you are thinking of the scenario where a dataset name could span 2 namespaces?

Cool will add.

[wslulciuc]

LGTM! 💯 🥇