Fix goroutine leaks in some packages

[akagami-harsh]

Which problem is this PR solving?

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

Description of the changes

• fix goroutine leaks in some package and add goleak check

How was this change tested?

• go test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7d1cc9f) 52.59% compared to head (36a590a) 95.60%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5038       +/-   ##
===========================================
+ Coverage   52.59%   95.60%   +43.00%     
===========================================
  Files         145      319      +174     
  Lines        8599    18794    +10195     
===========================================
+ Hits         4523    17968    +13445     
+ Misses       3728      663     -3065     
+ Partials      348      163      -185     

Flag	Coverage Δ
cassandra-3.x	25.61% <ø> (ø)
cassandra-4.x	25.61% <ø> (ø)
elasticsearch-5.x	19.88% <ø> (ø)
elasticsearch-6.x	19.88% <ø> (ø)
elasticsearch-7.x	20.00% <ø> (-0.02%)	⬇️
elasticsearch-8.x	20.11% <ø> (ø)
grpc-badger	19.50% <ø> (ø)
kafka	14.10% <ø> (ø)
opensearch-1.x	20.00% <ø> (-0.02%)	⬇️
opensearch-2.x	20.02% <ø> (ø)
unittests	93.34% <ø> (?)

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[yurishkuro]

🎉
Thanks!