*: remove functions which are not useful anymore

[rleungx]

What problem does this PR solve?

Just as the title says.

What is changed and how it works?

• remove GetLeaderSchedulePolicy
• remove adjustBalanceLimit

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• disksing
• nolouch

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[codecov]

Codecov Report

Merging #4110 (1ae8bdc) into master (3f53f1e) will increase coverage by 0.08%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #4110      +/-   ##
==========================================
+ Coverage   74.53%   74.62%   +0.08%     
==========================================
  Files         258      258              
  Lines       26323    26314       -9     
==========================================
+ Hits        19621    19637      +16     
+ Misses       4963     4939      -24     
+ Partials     1739     1738       -1     

Flag	Coverage Δ
unittests	74.62% <75.00%> (+0.08%)	⬆️

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

Impacted Files	Coverage Δ
server/cluster/cluster.go	82.20% <ø> (ø)
server/core/basic_cluster.go	91.27% <ø> (ø)
server/core/hot_region_storage.go	74.34% <ø> (ø)
server/schedule/checker/priority_checker.go	78.94% <ø> (ø)
server/schedule/operator_controller.go	84.66% <ø> (-0.89%)	⬇️
server/schedulers/hot_region.go	83.10% <ø> (ø)
server/schedulers/utils.go	94.58% <ø> (-0.10%)	⬇️
server/grpc_service.go	47.05% <50.00%> (+0.22%)	⬆️
server/schedulers/balance_leader.go	91.55% <100.00%> (ø)
server/election/leadership.go	84.61% <0.00%> (-3.30%)	⬇️
... and 15 more

---

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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: 42d319d