chore(upstream): remove default port for upstream health check

[zaunist]

Please answer these questions before submitting a pull request, or your PR will get closed.

Why submit this pull request?

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What changes will this PR take into?

Remove upstream health check default port.

Please update this section with detailed description.

Related issues

fix #2186

Checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #2278 (bb33e79) into master (bec322a) will increase coverage by 3.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2278      +/-   ##
==========================================
+ Coverage   64.97%   68.07%   +3.09%     
==========================================
  Files         184      127      -57     
  Lines        7275     3370    -3905     
  Branches      829      829              
==========================================
- Hits         4727     2294    -2433     
+ Misses       2263     1076    -1187     
+ Partials      285        0     -285     

Flag	Coverage Δ
backend-e2e-test	?
backend-unit-test	?
frontend-e2e-test	68.07% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...mponents/Upstream/components/active-check/Port.tsx	100.00% <ø> (ø)
web/src/helpers.tsx	70.49% <0.00%> (-3.28%)	⬇️
api/internal/filter/logging.go
api/internal/handler/label/label.go
api/internal/handler/upstream/upstream.go
api/internal/utils/closer.go
api/internal/handler/migrate/migrate.go
api/internal/core/store/store_mock.go
api/internal/utils/version.go
api/internal/log/log.go
... and 49 more

---

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[zaunist]

cc @bzp2010 @LiteSun @guoqqqi @Baoyuantop

[guoqqqi]

LGTM

[LiteSun]

LGTM