Fix Swagger JSON autogeneration issues.

[zeripath]

When autogenerating a swager client from the current swagger.v1.json, at least in Java, there is an issue whereby the use of schema references for the forbidden and empty responses leads to a broken client being created due to swagger believing that these represent an unspecified object. This pull requests removes these unnecessary schema references for the API references where a description for the empty/forbidden responses is provided.

[codecov-io]

Codecov Report

Merging #4845 into master will increase coverage by 0.03%.
The diff coverage is 47.1%.

@@            Coverage Diff             @@
##           master    #4845      +/-   ##
==========================================
+ Coverage    37.4%   37.43%   +0.03%     
==========================================
  Files         308      308              
  Lines       45612    45711      +99     
==========================================
+ Hits        17060    17113      +53     
- Misses      26095    26138      +43     
- Partials     2457     2460       +3

Impacted Files	Coverage Δ
routers/api/v1/org/member.go	0% <ø> (ø)	⬆️
routers/api/v1/org/hook.go	0% <0%> (ø)	⬆️
routers/api/v1/repo/release_attachment.go	0% <0%> (ø)	⬆️
routers/api/v1/repo/issue_tracked_time.go	0% <0%> (ø)	⬆️
routers/api/v1/repo/issue.go	30.17% <0%> (+0.08%)	⬆️
routers/api/v1/repo/label.go	0% <0%> (ø)	⬆️
routers/api/v1/repo/milestone.go	0% <0%> (ø)	⬆️
routers/api/v1/admin/org.go	0% <0%> (ø)	⬆️
routers/api/v1/repo/key.go	20.24% <0%> (-0.26%)	⬇️
routers/api/v1/admin/repo.go	0% <0%> (ø)	⬆️
... and 15 more

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[sapk]

I remember the opposite problem with go version of swagger but since CI doesn't seems to complain. LGTM

[zeripath]

My fixes for the CreateAccessToken are only partial see #5126.

It's not obvious where the setting for AccessToken going in to the header is set.

[zeripath]

Most of the swagger api descriptions incorrectly use the integer type when the underlying go code actually uses int64. I've added further changes to account for this.

[zeripath]

I've also noted that the swagger description of GET /repos/{owner}/{repo}/pulls was also inadequate

[lafriks]

@lunny need your approval