add goleak check in tests that do not fail

[akagami-harsh]

Which problem is this PR solving?

• part of Enable and enforce goroutine leak checks in tests #5006

Description of the changes

• added goleak checks to all tests that do not fail
• minor bug fix in check-goleak-file.sh
  • make goleak was listing directories that do not contain any test, added a if condition to prevent that

How was this change tested?

• make test

[yurishkuro]

Awesome!

[yurishkuro]

@akagami-harsh some packages do fail, e.g.

goleak: Errors on successful test run: found unexpected goroutines:
[Goroutine 6 in state select, with github.com/golang/glog.(*fileSink).flushDaemon on top of the stack:
github.com/golang/glog.(*fileSink).flushDaemon(0x322b1d8)
	/home/runner/go/pkg/mod/github.com/golang/glog@v1.1.2/glog_file.go:351 +0x17c
created by github.com/golang/glog.init.1 in goroutine 1
	/home/runner/go/pkg/mod/github.com/golang/glog@v1.1.2/glog_file.go:166 +0x225
]
❌ FAIL	github.com/jaegertracing/jaeger/plugin/storage/integration	3.360s

What method did you use to validate "tests that do not fail"?

[yurishkuro]

The integration package contains numerous conditions (build tags and env var checks) that disable/enable various storage tests, so it's difficult to test locally to ensure full coverage. I removed it for now.

[akagami-harsh]

What method did you use to validate "tests that do not fail"?

i tested it locally by using make test and by running package tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5ef59f6) 95.62% compared to head (9a02522) 95.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5025      +/-   ##
==========================================
- Coverage   95.62%   95.61%   -0.02%     
==========================================
  Files         319      319              
  Lines       18786    18786              
==========================================
- Hits        17965    17963       -2     
- Misses        659      661       +2     
  Partials      162      162              

Flag	Coverage Δ
cassandra-3.x	25.63% <ø> (ø)
cassandra-4.x	25.63% <ø> (ø)
elasticsearch-5.x	19.90% <ø> (ø)
elasticsearch-6.x	19.89% <ø> (-0.02%)	⬇️
elasticsearch-7.x	20.02% <ø> (-0.02%)	⬇️
elasticsearch-8.x	20.13% <ø> (ø)
grpc-badger	19.53% <ø> (+0.01%)	⬆️
kafka	14.12% <ø> (ø)
opensearch-1.x	20.02% <ø> (-0.02%)	⬇️
opensearch-2.x	20.02% <ø> (-0.02%)	⬇️
unittests	93.36% <ø> (-0.02%)	⬇️

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