Refactor security related unit tests

[ldclakmal]

Purpose

$subject

Related to: ballerina-platform/ballerina-library#584

[codecov]

Codecov Report

Merging #445 (eb74e30) into master (11bec99) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #445      +/-   ##
============================================
- Coverage     77.15%   77.07%   -0.08%     
  Complexity       62       62              
============================================
  Files           318      318              
  Lines         16379    16379              
  Branches       3843     3843              
============================================
- Hits          12637    12624      -13     
- Misses         3033     3040       +7     
- Partials        709      715       +6     

Impacted Files	Coverage Δ
...sport/message/ClientRemoteFlowControlListener.java	52.63% <0.00%> (-15.79%)	⬇️
...ransport/contractimpl/common/states/StateUtil.java	68.62% <0.00%> (-11.77%)	⬇️
...ansport/message/DefaultBackPressureObservable.java	64.28% <0.00%> (-7.15%)	⬇️
...ansport/contractimpl/HttpOutboundRespListener.java	68.88% <0.00%> (-4.45%)	⬇️
...contractimpl/listener/states/ReceivingHeaders.java	48.97% <0.00%> (-4.09%)	⬇️
...ransport/message/DefaultFullHttpMessageFuture.java	60.00% <0.00%> (-4.00%)	⬇️
...nsport/contractimpl/DefaultHttpResponseFuture.java	71.42% <0.00%> (-3.90%)	⬇️
...tractimpl/sender/ConnectionAvailabilityFuture.java	69.51% <0.00%> (-3.66%)	⬇️
...nalang/net/transport/contractimpl/common/Util.java	72.65% <0.00%> (ø)
...transport/message/Http2InboundContentListener.java	53.84% <0.00%> (+2.56%)	⬆️
... and 3 more

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