[PR from CLI tool] Address -Wunused-variable and -Wunused-parameter warnings in lightweight tests

[aggarw13]

Address -Wunused-variable and -Wunused-parameter warnings in mqtt_lightweight_utest.c file

[muneebahmed10]

Branch?

[codecov-commenter]

Codecov Report

Merging #1117 into development will increase coverage by 1.91%.
The diff coverage is 81.48%.

@@               Coverage Diff               @@
##           development    #1117      +/-   ##
===============================================
+ Coverage        96.54%   98.46%   +1.91%     
===============================================
  Files                9        4       -5     
  Lines             5643     1301    -4342     
  Branches           641      383     -258     
===============================================
- Hits              5448     1281    -4167     
+ Misses               9        0       -9     
+ Partials           186       20     -166     

Impacted Files	Coverage Δ
libraries/standard/mqtt/src/mqtt.c	99.46% <ø> (+5.05%)	⬆️
libraries/standard/mqtt/src/mqtt_lightweight.c	97.44% <ø> (+2.92%)	⬆️
libraries/standard/mqtt/src/mqtt_state.c	98.46% <ø> (+2.52%)	⬆️
libraries/standard/http/src/http_client.c	98.53% <81.48%> (+11.05%)	⬆️

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