Fix flaky launcher test

[khanhtc1202]

What this PR does / why we need it:

Suspend below flaky test

(12:45:17) FAIL: //pkg/app/launcher/cmd/launcher:go_default_test (see /private/var/tmp/_bazel_/2d45f513ea3114123209fc663da944fe/execroot/pipe/bazel-out/darwin-fastbuild/testlogs/pkg/app/launcher/cmd/launcher/go_default_test/test.log)
(12:45:17) INFO: From Testing //pkg/app/launcher/cmd/launcher:go_default_test:
==================== Test output for //pkg/app/launcher/cmd/launcher:go_default_test:
--- FAIL: TestCommand (0.00s)
    binary_test.go:32: 
                Error Trace:    binary_test.go:32
                Error:          Should be false
                Test:           TestCommand
FAIL
================================================================================

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[pipecd-bot]

Code coverage for golang is 32.10%. This pull request does not change code coverage.

[nghialv]

We should avoid using time.Sleep in tests.
So how about adding <- c.stoppedCh to before this line instead of fixing the test.
https://github.com/pipe-cd/pipe/blob/master/pkg/app/launcher/cmd/launcher/binary.go#L53

[khanhtc1202]

That's better, thank you. Addressed by de5214b

[pipecd-bot]

Code coverage for golang is 32.11%. This pull request increases coverage by 0.01%.

File	Function	Base	Head	Diff
pkg/app/launcher/cmd/launcher/binary.go	command.GracefulStop	66.67%	100.00%	+33.33%

[nghialv]

/approve

[pipecd-bot]

This pull request is APPROVED by nghialv.

Approvers can cancel the approval by writing /approve cancel in a comment. Any additional commits also will change this pull request to be not-approved.