tests/server: reduce test time for heartbeat msg cannot be triggered

[HuSharp]

What problem does this PR solve?

Issue Number: Ref #7969

What is changed and how does it work?

Performance

can reduce test time from 5s+1min(wait for keepalive) to 5s

Why change?

Previous test want to mock client send region heartbeat to server, and then server will return msg to client.

But Previous test only can be triggered by keepalive https://github.com/tikv/pd/blob/f51f9134558e793e7ea08fc32cef672c7afa37b7/pkg/schedule/hbstream/heartbeat_streams.go#L154 So I changed region id to 0 which will send error msg https://github.com/tikv/pd/blob/5c58dddc66feb343e19d7f792852bb5b6184d9dd/server/grpc_service.go#L1279-L1284 and then client will get msg by https://github.com/tikv/pd/blob/f51f9134558e793e7ea08fc32cef672c7afa37b7/pkg/schedule/hbstream/heartbeat_streams.go#L127

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot[bot]]

[REVIEW NOTIFICATION]

This pull request has not been approved.

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment. After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review. Reviewer can cancel approval by submitting a request changes review.

[codecov[bot]]

Codecov Report

Merging #7998 (18e96a6) into master (67461dd) will increase coverage by 0.03%. Report is 1 commits behind head on master. The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7998      +/-   ##
==========================================
+ Coverage   77.27%   77.30%   +0.03%     
==========================================
  Files         468      468              
  Lines       60890    60890              
==========================================
+ Hits        47055    47074      +19     
+ Misses      10291    10288       -3     
+ Partials     3544     3528      -16     

Flag	Coverage Δ
unittests	77.30% <ø> (+0.03%)	:arrow_up:

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

[HuSharp]

@rleungx @lhy1024 friendly ping :)

[HuSharp]

@rleungx @lhy1024 friendly ping :)