pd-ctl: escape the scheduler name for some commands

[JmPotato]

What problem does this PR solve?

Issue Number: Close #7798.

What is changed and how does it work?

Escape the scheduler name for some commands.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

./bin/pd-ctl -i
» scheduler show
[
  "balance-hot-region-scheduler",
  "evict-slow-store-scheduler",
  "scatter-range-test#",
  "balance-region-scheduler",
  "balance-leader-scheduler"
]

» scheduler remove scatter-range-test#
Success!
» scheduler show
[
  "balance-region-scheduler",
  "balance-leader-scheduler",
  "balance-hot-region-scheduler",
  "evict-slow-store-scheduler"
]

Release note

Fix the bug that prevents pd-ctl from removing schedulers with special characters.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[JmPotato]

/check-issue-triage-complete

[codecov]

Codecov Report

Merging #7799 (e523394) into master (54ffd34) will decrease coverage by 0.08%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7799      +/-   ##
==========================================
- Coverage   73.45%   73.37%   -0.08%     
==========================================
  Files         432      432              
  Lines       47793    47793              
==========================================
- Hits        35104    35069      -35     
- Misses       9650     9672      +22     
- Partials     3039     3052      +13     

Flag	Coverage Δ
unittests	73.37% <ø> (-0.08%)	⬇️

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

[JmPotato]

/merge

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[ti-chi-bot]

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

Commit hash: e523394