mcs: move service name to utils/constant.go

[lhy1024]

What problem does this PR solve?

Issue Number: Ref #5836.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (7a0ce10) 74.46% compared to head (8a52699) 74.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6172      +/-   ##
==========================================
+ Coverage   74.46%   74.53%   +0.06%     
==========================================
  Files         393      393              
  Lines       38519    38519              
==========================================
+ Hits        28685    28711      +26     
+ Misses       7288     7274      -14     
+ Partials     2546     2534      -12     

Flag	Coverage Δ
unittests	74.53% <100.00%> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
pkg/mcs/resource_manager/server/server.go	59.22% <100.00%> (ø)
pkg/mcs/tso/server/server.go	51.46% <100.00%> (ø)
server/grpc_service.go	51.98% <100.00%> (+0.29%)	⬆️
server/server.go	75.51% <100.00%> (+0.97%)	⬆️
tests/cluster.go	79.80% <100.00%> (ø)

... and 23 files with indirect coverage changes

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[rleungx]

/merge

[ti-chi-bot]

@rleungx: 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: 8a52699