Add unit tests for listener auth with LDAP user store

[ldclakmal]

Purpose

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

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #451 (d26c496) into master (deff3bd) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #451      +/-   ##
============================================
+ Coverage     77.10%   77.24%   +0.14%     
  Complexity       62       62              
============================================
  Files           318      318              
  Lines         16390    16390              
  Branches       3847     3847              
============================================
+ Hits          12637    12661      +24     
+ Misses         3045     3012      -33     
- Partials        708      717       +9     

Impacted Files	Coverage Δ
http-ballerina/auth_desugar.bal	96.59% <100.00%> (+9.09%)	⬆️
...th_listener_ldap_user_store_basic_auth_handler.bal	95.65% <100.00%> (ø)
...sport/message/ClientRemoteFlowControlListener.java	52.63% <0.00%> (-15.79%)	⬇️
...ansport/message/DefaultBackPressureObservable.java	64.28% <0.00%> (-7.15%)	⬇️
...tractimpl/sender/ConnectionAvailabilityFuture.java	69.51% <0.00%> (-4.88%)	⬇️
...nsport/contractimpl/DefaultHttpResponseFuture.java	72.72% <0.00%> (-2.60%)	⬇️
...net/transport/message/HttpMessageDataStreamer.java	75.00% <0.00%> (-2.28%)	⬇️
...alang/net/transport/message/HttpCarbonMessage.java	87.00% <0.00%> (-1.70%)	⬇️
...alang/net/http/service/signature/ParamHandler.java	86.02% <0.00%> (-1.48%)	⬇️
...ng/net/http/client/actions/AbstractHTTPAction.java	65.73% <0.00%> (-0.80%)	⬇️
... and 9 more

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