*: supports build pd-server with fail point

[nolouch]

What problem does this PR solve?

Issue Number: Close #4399

What is changed and how does it work?

In order can use fail points in testing, need to build a special binary
- supports build pd-server with fail point

Check List

Tests

• Manual test (add detailed scripts or steps below)

make pd-server-failpoint 
➜  bin git:(support-make-failpoint) tiup playground v7.1.1  --tiflash=0  --pd=1 --pd.binpath=./pd-server
➜  bin git:(support-make-failpoint) curl http://127.0.0.1:2379/pd/api/v1/fail
malformed request URI
➜  bin git:(support-make-failpoint) curl http://127.0.0.1:2379/pd/api/v1/fail/test
failed to GET: error on test: failpoint: failpoint does not exist
➜  bin git:(support-make-failpoint) curl -X PUT -d 'return(3474484975246189105)'  http://127.0.0.1:2379/pd/api/v1/fail/github.com/tikv/pd/server/exitCampaignLeader
➜  bin git:(support-make-failpoint) curl  http://127.0.0.1:2379/pd/api/v1/fail/                      
=return(3474484975246189105)
pd/server/exitCampaignLeader=return(3474484975246189105)


make pd-server
➜  bin git:(support-make-failpoint) tiup playground v7.1.1  --tiflash=0  --pd=1 --pd.binpath=./pd-server
➜  bin git:(support-make-failpoint) curl  http://127.0.0.1:2379/pd/api/v1/fail/
404 page not found

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[codecov]

Codecov Report

Merging #6946 (0f390db) into master (70e9ffc) will decrease coverage by 0.04%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6946      +/-   ##
==========================================
- Coverage   74.36%   74.33%   -0.04%     
==========================================
  Files         427      427              
  Lines       45327    45334       +7     
==========================================
- Hits        33706    33697       -9     
- Misses       8651     8669      +18     
+ Partials     2970     2968       -2     

Flag	Coverage Δ
unittests	74.33% <0.00%> (-0.04%)	⬇️

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[HuSharp]

LGTM!

[nolouch]

/merge

[ti-chi-bot]

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/run-all-tests

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[ti-chi-bot]

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

Commit hash: 4dd911e