cluster: increase schedule limit during upgrade of tikv

[AstroProfundis]

What problem does this PR solve?

Implement task 2 in #1033

What is changed and how it works?

Increase schedule limits before upgrade of TiKV, and set them back after.

Check List

Tests

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

Code changes

• Has exported function/method change

Side effects

• Increased code complexity

Release notes:

NONE

[codecov-io]

Codecov Report

Merging #1161 (e4626f8) into master (4980c14) will decrease coverage by 26.92%.
The diff coverage is 24.48%.

@@             Coverage Diff             @@
##           master    #1161       +/-   ##
===========================================
- Coverage   53.49%   26.56%   -26.93%     
===========================================
  Files         288      274       -14     
  Lines       20412    18977     -1435     
===========================================
- Hits        10919     5042     -5877     
- Misses       7805    13169     +5364     
+ Partials     1688      766      -922     

Flag	Coverage Δ
cluster	?
dm	?
integrate	15.96% <22.44%> (-31.93%)	⬇️
playground	3.10% <0.00%> (-0.02%)	⬇️
tiup	16.54% <22.44%> (-0.01%)	⬇️
unittest	22.84% <5.55%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
pkg/cluster/api/pdapi.go	0.00% <0.00%> (-57.06%)	⬇️
pkg/repository/model/model.go	46.61% <46.15%> (+0.15%)	⬆️
cmd/mirror.go	48.70% <66.66%> (-0.22%)	⬇️
pkg/repository/v1_repository.go	62.62% <66.66%> (-1.02%)	⬇️
pkg/meta/paths.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/utils/utils.go	0.00% <0.00%> (-100.00%)	⬇️
components/dm/main.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/logger/log/log.go	0.00% <0.00%> (-100.00%)	⬇️
components/cluster/main.go	0.00% <0.00%> (-100.00%)	⬇️
pkg/cluster/task/builder.go	0.00% <0.00%> (-100.00%)	⬇️
... and 190 more

---

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[lucklove]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• lucklove

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[lucklove]

/merge

[ti-chi-bot]

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

Commit hash: 7760873

[ti-chi-bot]

@AstroProfundis: Your PR was out of date, I have automatically updated it for you.

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