Remove unnecessary .nocover files

[yurishkuro]

Which problem is this PR solving?

• Part of Implement missing unit tests #5068
• Looks like test were added but .nocover files not removed.

Description of the changes

• Remove unnecessary .nocover files.

How was this change tested?

• Check if this affects coverage in CI.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.34%. Comparing base (60c2efb) to head (5136427).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5642   +/-   ##
=======================================
  Coverage   96.34%   96.34%           
=======================================
  Files         327      327           
  Lines       16016    16018    +2     
=======================================
+ Hits        15431    15433    +2     
  Misses        407      407           
  Partials      178      178           

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.93% <ø> (ø)
cassandra-3.x-v1	16.45% <ø> (ø)
cassandra-3.x-v2	1.85% <ø> (ø)
cassandra-4.x-v1	16.45% <ø> (ø)
cassandra-4.x-v2	1.85% <ø> (ø)
elasticsearch-7.x-v1	18.89% <ø> (ø)
elasticsearch-8.x-v1	19.09% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v2	19.09% <ø> (ø)
grpc_v1	9.48% <ø> (+0.01%)	⬆️
grpc_v2	7.53% <ø> (ø)
kafka	9.77% <ø> (ø)
opensearch-1.x-v1	18.94% <ø> (ø)
opensearch-2.x-v1	18.94% <ø> (ø)
opensearch-2.x-v2	18.94% <ø> (ø)
unittests	94.22% <100.00%> (+<0.01%)	⬆️

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[jkowall]

LGTM!