global sort,metrics: rename upload worker count metrics

[fzzf678]

What problem does this PR solve?

Issue Number: close #61283

Problem Summary:
Actually, this panel indicate the activate upload worker count. For GCS storage we initialized some workers, so we can count the number of active uploader when uploading. But the uploader in the S3/KS3 SDK is encapsulated, and a concurrency is passed in when calling it. We cannot see how this parameter is used from outside, so the number of active uploader cannot be obtained. This problem was noticed when adding：monitoring.

tidb/br/pkg/storage/helper.go

Line 39 in d952ac5

// For S3, we cannot get it.

What changed and how does it work?

To avoid misunderstanding of this metrics, we rename this panel's title as Active parallel Upload Worker Count and supply the valid scope in description.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  After this PR, the panel will display like this:
  
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5422%. Comparing base (3ceec5f) to head (75d9c62).
Report is 12 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61276        +/-   ##
================================================
+ Coverage   73.1714%   73.5422%   +0.3707%     
================================================
  Files          1726       1726                
  Lines        478241     479750      +1509     
================================================
+ Hits         349936     352819      +2883     
+ Misses       106847     105437      -1410     
- Partials      21458      21494        +36     

Flag	Coverage Δ
integration	42.5626% <ø> (?)
unit	72.4320% <ø> (-0.0045%)	⬇️

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	46.9848% <ø> (-0.6149%)	⬇️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CbcWestwolf, tangenta

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-05-23 06:57:05.017364726 +0000 UTC m=+16050.962629536: ☑️ agreed by tangenta.
• 2025-05-23 08:25:47.288223079 +0000 UTC m=+21373.233487889: ☑️ agreed by CbcWestwolf.

[tiprow]

@fzzf678: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	75d9c62	link	true	/test fast_test_tiprow

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