[tests] : Adding unit test for the entire envoy listener configuration

[snehachhabria]

Description:

This PR adds a unit test for the entire listener configuration.

Fixes : #2056

Signed-off-by: Sneha Chhabria snchh@microsoft.com

Affected area:

• New Functionality [ ]
• Documentation [ ]
• Install [ ]
• Control Plane [ ]
• CLI Tool [ ]
• Certificate Management [ ]
• Networking [ ]
• Metrics [ ]
• SMI Policy [ ]
• Security [ ]
• Tests [X]
• CI System [ ]
• Performance [ ]
• Other [ ]

Please answer the following questions with yes/no.

• Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution? no

[codecov-io]

Codecov Report

Merging #2358 (7e193cc) into main (e109d6a) will increase coverage by 1.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2358      +/-   ##
==========================================
+ Coverage   57.23%   58.55%   +1.32%     
==========================================
  Files         149      149              
  Lines        6660     6660              
==========================================
+ Hits         3812     3900      +88     
+ Misses       2843     2746      -97     
- Partials        5       14       +9     

Impacted Files	Coverage Δ
pkg/envoy/route/config.go	96.03% <0.00%> (+0.79%)	⬆️
pkg/envoy/lds/inmesh.go	67.27% <0.00%> (+13.18%)	⬆️
pkg/envoy/lds/listener.go	89.06% <0.00%> (+45.31%)	⬆️
pkg/envoy/lds/response.go	60.00% <0.00%> (+52.72%)	⬆️

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