Delete organization endpoint added

[shashvat-kedia]

Fix to issue #5499

New API endpoint added:-
DELETE api/v1/orgs/{org}

[codecov-io]

Codecov Report

Merging #5601 into master will decrease coverage by 0.01%.
The diff coverage is 9.09%.

@@            Coverage Diff             @@
##           master    #5601      +/-   ##
==========================================
- Coverage   37.53%   37.52%   -0.02%     
==========================================
  Files         322      322              
  Lines       47286    47307      +21     
==========================================
+ Hits        17749    17750       +1     
- Misses      26986    27006      +20     
  Partials     2551     2551

Impacted Files	Coverage Δ
routers/api/v1/org/org.go	42.38% <0%> (-6.48%)	⬇️
routers/api/v1/api.go	73.45% <100%> (+0.05%)	⬆️

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[lafriks]

I moved it to 1.7.0 as it is small change

[zeripath]

Hmm... @lafriks Something went horribly wrong during the MSSQL continuous integration test in build https://drone.gitea.io/go-gitea/gitea/4694 and it looks like the Gitea server went down mid-test. This doesn't seem to be due to these changes.

Restarting the CI through a remerge into master might fix this