test(pr): Add tests on TerraformPR Controller

[codecov-commenter]

Codecov Report

Merging #145 (58919b6) into main (96c0c2a) will increase coverage by 17.83%. The diff coverage is 64.28%.

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@@             Coverage Diff             @@
##             main     #145       +/-   ##
===========================================
+ Coverage   52.16%   69.99%   +17.83%     
===========================================
  Files          23       22        -1     
  Lines        1549     1493       -56     
===========================================
+ Hits          808     1045      +237     
+ Misses        700      388      -312     
- Partials       41       60       +19     

Impacted Files	Coverage Δ
api/v1alpha1/terraformpullrequest_types.go	16.66% <0.00%> (-83.34%)	:arrow_down:
...nal/controllers/terraformpullrequest/conditions.go	82.57% <100.00%> (+82.57%)	:arrow_up:
...nal/controllers/terraformpullrequest/controller.go	34.92% <100.00%> (+34.92%)	:arrow_up:
internal/controllers/terraformpullrequest/layer.go	83.56% <100.00%> (+83.56%)	:arrow_up:
...nternal/controllers/terraformpullrequest/states.go	56.97% <100.00%> (+56.97%)	:arrow_up:

... and 1 file with indirect coverage changes

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