skip transaction for POST /service/token

[liubin]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Habor doesnot support POST /service/token endpoint, put this request into a transaction will consume
extra database resources and generate many logs.

Logs in core and nginx:

2023-09-12T10:59:47+08:00 [DEBUG] [/antregistry/src/server/middleware/log/log.go:30]: attach request id aaa37a96-ec65-40f8-821d-6267e8d5f5a6 to the logger for the request POST /service/token
[ORM]2023/09/12 10:59:47  -[Queries/default] - [  OK /  db.BeginTx /     4.3ms] - [START TRANSACTION]
2023-09-12T10:59:47+08:00 [DEBUG] [/antregistry/src/server/middleware/artifactinfo/artifact_info.go:55]: In artifact info middleware, url: /service/token
2023-09-12T10:59:47+08:00 [DEBUG] [/antregistry/src/server/middleware/security/unauthorized.go:28][requestID="aaa37a96-ec65-40f8-821d-6267e8d5f5a6"]: an unauthorized security context generated for request POST /service/token
[ORM]2023/09/12 10:59:47  -[Queries/default] - [  OK / tx.Rollback /     4.6ms] - [ROLLBACK]
2023-09-12T10:59:48+08:00 [DEBUG] [/antregistry/src/server/middleware/log/log.go:30]: attach request id ae9747af-f028-4acf-a86a-db1d96ce9d76 to the logger for the request GET /service/token

[2023-09-12T11:09:33+08:00] 10.2.0.84 - "POST /service/token HTTP/1.1" 405 19 "-" "Go-http-client/1.1" 0.022 0.022 .

Issue being fixed

Fixes #(issue)

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• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
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• Made sure tests are passing and test coverage is added if needed.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ee6f61c) 45.36% compared to head (d2a089d) 45.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19339      +/-   ##
==========================================
- Coverage   45.36%   45.33%   -0.03%     
==========================================
  Files         244      244              
  Lines       13333    13333              
  Branches     2720     2720              
==========================================
- Hits         6048     6045       -3     
- Misses       6984     6987       +3     
  Partials      301      301              

Flag	Coverage Δ
unittests	45.33% <ø> (-0.03%)	⬇️

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see 3 files with indirect coverage changes

[Vad1mo]

makes sense

[github-actions]

This PR is being marked stale due to a period of inactivty. If this PR is still relevant, please comment or remove the stale label. Otherwise, this PR will close in 30 days.

[chlins]

lgtm