dashboard: fix a bug that could not handle proxy requests correctly (#5326)

[ti-chi-bot]

This is an automated cherry-pick of #5326

What problem does this PR solve?

Issue Number: Close #5321

What is changed and how does it work?

Only process headers added by PD.

Check List

Tests

• Unit test

Related changes

• Need to cherry-pick to the release branch

Release note

Fix a bug that could not handle dashboard proxy requests correctly.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 57c256a

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[nolouch]

/rebuild

[codecov]

Codecov Report

Base: 74.67% // Head: 74.75% // Increases project coverage by +0.08% 🎉

Coverage data is based on head (1b5e9ac) compared to base (d59e6ce).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.4    #5356      +/-   ##
===============================================
+ Coverage        74.67%   74.75%   +0.08%     
===============================================
  Files              265      265              
  Lines            28002    28003       +1     
===============================================
+ Hits             20911    20935      +24     
+ Misses            5225     5204      -21     
+ Partials          1866     1864       -2     

Flag	Coverage Δ
unittests	74.75% <100.00%> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
pkg/dashboard/adapter/redirector.go	91.30% <100.00%> (+6.85%)	⬆️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
pkg/dashboard/adapter/manager.go	78.72% <0.00%> (-4.26%)	⬇️
server/region_syncer/client.go	79.84% <0.00%> (-3.88%)	⬇️
server/election/lease.go	86.15% <0.00%> (-1.54%)	⬇️
server/server.go	70.78% <0.00%> (-0.90%)	⬇️
server/tso/allocator_manager.go	64.05% <0.00%> (-0.84%)	⬇️
server/grpc_service.go	51.25% <0.00%> (-0.20%)	⬇️
server/cluster/coordinator.go	74.78% <0.00%> (+0.42%)	⬆️
server/core/storage.go	69.31% <0.00%> (+0.75%)	⬆️
... and 9 more

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