use -toolexec to avoid manual preprocessing

[lance6716]

What problem does this PR solve?

don't need to use failpoint-ctl enable to manually preprocess the souce codes

What is changed and how it works?

use -toolexec

Check List

Tests

• Manual test (add detailed scripts or steps below)

in tidb repo, this test will fail if failpoint is not enabled

# lance6716 @ lances-MacBook-Air in ~/Projects/tidb on git:master o [14:56:53]
$ go test  ./pkg/util/cpu/ -test.run TestFailpointCPUValue
--- FAIL: TestFailpointCPUValue (0.20s)
    cpu_test.go:93:
        	Error Trace:	/Users/lance6716/Projects/tidb/pkg/util/cpu/cpu_test.go:93
        	Error:      	Should be true
        	Test:       	TestFailpointCPUValue
FAIL
FAIL	github.com/pingcap/tidb/pkg/util/cpu	0.662s
FAIL

with the new failpoint-toolexec it can pass, which proves it works.

# lance6716 @ lances-MacBook-Air in ~/Projects/tidb on git:master o [14:56:19]
$ GOCACHE=/tmp/failpoint-cache go test  ./pkg/util/cpu/ -test.run TestFailpointCPUValue -toolexec /tmp/failpoint-toolexec -test.v
=== RUN   TestFailpointCPUValue
[2024/04/11 14:56:51.491 +08:00] [ERROR] [cpu.go:67] [GetCgroupCPU] [error=mockAddBatchDDLJobsErr] [errorVerbose="mockAddBatchDDLJobsErr\ngithub.com/pingcap/tidb/pkg/util/cgroup.GetCgroupCPU\n\t/var/folders/c_/dth_nd_53f5d4yw5h5tyfj2h0000gn/T/failpoint-toolexec/github.com/pingcap/tidb/pkg/util/cgroup/cgroup_cpu_unsupport.go:32\ngithub.com/pingcap/tidb/pkg/util/cpu.(*Observer).Start\n\t/var/folders/c_/dth_nd_53f5d4yw5h5tyfj2h0000gn/T/failpoint-toolexec/github.com/pingcap/tidb/pkg/util/cpu/cpu.go:64\ngithub.com/pingcap/tidb/pkg/util/cpu_test.TestFailpointCPUValue\n\t/Users/lance6716/Projects/tidb/pkg/util/cpu/cpu_test.go:89\ntesting.tRunner\n\t/opt/homebrew/Cellar/go/1.21.2/libexec/src/testing/testing.go:1595\nruntime.goexit\n\t/opt/homebrew/Cellar/go/1.21.2/libexec/src/runtime/asm_arm64.s:1197"] [stack="github.com/pingcap/tidb/pkg/util/cpu.(*Observer).Start\n\t/var/folders/c_/dth_nd_53f5d4yw5h5tyfj2h0000gn/T/failpoint-toolexec/github.com/pingcap/tidb/pkg/util/cpu/cpu.go:67\ngithub.com/pingcap/tidb/pkg/util/cpu_test.TestFailpointCPUValue\n\t/Users/lance6716/Projects/tidb/pkg/util/cpu/cpu_test.go:89\ntesting.tRunner\n\t/opt/homebrew/Cellar/go/1.21.2/libexec/src/testing/testing.go:1595"]
--- PASS: TestFailpointCPUValue (2.00s)
PASS
ok  	github.com/pingcap/tidb/pkg/util/cpu	2.337s

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to be included in the release note

[codecov]

Codecov Report

Merging #81 (1fbf934) into master (2eaa328) will decrease coverage by 8.0701%.
The diff coverage is 3.1250%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master        #81        +/-   ##
================================================
- Coverage   84.4318%   76.3617%   -8.0701%     
================================================
  Files             7          8         +1     
  Lines           880        973        +93     
================================================
  Hits            743        743                
- Misses           84        177        +93     
  Partials         53         53                

[tisonkun]

Thank you!