client: Merge the two tsoStream types to reuse the same error handling and metrics reporting code

[MyonKeminta]

What problem does this PR solve?

Issue Number: Ref #8432

What is changed and how does it work?

client: Merge the two tsoStream types to reuse the same error handling and metrics reporting code

This commit merges the two `xxxTSOStream` types so that the error handling and metrics reporting logic for PD server deployment and TSO service deployment can be reused.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.36%. Comparing base (5d77447) to head (2c009ae).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8433      +/-   ##
==========================================
+ Coverage   77.32%   77.36%   +0.03%     
==========================================
  Files         472      472              
  Lines       61802    61798       -4     
==========================================
+ Hits        47789    47808      +19     
+ Misses      10434    10426       -8     
+ Partials     3579     3564      -15     

Flag	Coverage Δ
unittests	77.36% <94.87%> (+0.03%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JmPotato, nolouch

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• OWNERS [JmPotato,nolouch]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-25 11:57:16.563099372 +0000 UTC m=+1132658.554040843: ☑️ agreed by JmPotato.
• 2024-07-29 08:03:26.22879128 +0000 UTC m=+170122.508839347: ☑️ agreed by nolouch.