bugfix: Set pipefail when running unit tests to preserve exit code

[yurishkuro]

Which problem is this PR solving?

• When we switched unit test results forwarding using tee (💤 Swap Zipkin server for Zipkin Receiver from OTel Collector Contrib #5045), it breaks the CI validation since the exit code from tests is ignored.

Description of the changes

• Use set -o pipefail as we did in all other targets where the test output is piped into something

How was this change tested?

• Ran local validation to ensure that error code is returned with this change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bdd43f7) 95.56% compared to head (cd8ea2a) 95.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5057      +/-   ##
==========================================
- Coverage   95.56%   95.53%   -0.04%     
==========================================
  Files         313      313              
  Lines       18160    18160              
==========================================
- Hits        17355    17349       -6     
- Misses        645      649       +4     
- Partials      160      162       +2     

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	20.02% <ø> (ø)
elasticsearch-8.x	20.09% <ø> (-0.02%)	⬇️
grpc-badger	19.51% <ø> (+0.01%)	⬆️
kafka	14.10% <ø> (-13.41%)	⬇️
opensearch-1.x	20.02% <ø> (ø)
opensearch-2.x	20.00% <ø> (ø)
unittests	93.19% <ø> (-0.04%)	⬇️

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