*: simplify WaitUntil usage

[disksing]

Signed-off-by: disksing i@disksing.com

What problem does this PR solve?

There is always a C in the context, so we don't need the extra parameter.

What is changed and how it works?

Remove C from CheckFunc.

Check List

Tests

• Unit test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• JmPotato
• rleungx

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[codecov]

Codecov Report

Merging #4613 (6f94e35) into master (4f5a78a) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4613      +/-   ##
==========================================
- Coverage   74.75%   74.71%   -0.05%     
==========================================
  Files         281      281              
  Lines       27706    27706              
==========================================
- Hits        20713    20701      -12     
- Misses       5134     5137       +3     
- Partials     1859     1868       +9     

Flag	Coverage Δ
unittests	74.71% <100.00%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
pkg/testutil/testutil.go	94.11% <100.00%> (ø)
tests/cluster.go	82.97% <100.00%> (ø)
server/storage/endpoint/util.go	52.94% <0.00%> (-11.77%)	⬇️
server/storage/kv/etcd_kv.go	69.56% <0.00%> (-10.15%)	⬇️
server/tso/tso.go	61.36% <0.00%> (-4.55%)	⬇️
server/region_syncer/server.go	81.45% <0.00%> (-3.98%)	⬇️
server/tso/allocator_manager.go	63.10% <0.00%> (-1.07%)	⬇️
server/server.go	73.11% <0.00%> (-0.99%)	⬇️
pkg/btree/btree.go	87.37% <0.00%> (-0.76%)	⬇️
server/cluster/cluster.go	83.98% <0.00%> (-0.54%)	⬇️
... and 10 more

---

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[disksing]

/merge

[ti-chi-bot]

@disksing: 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: 6f94e35