refactor codebase of 'buildtest inspect'

[shahzebsiddiqui]

No description provided.

[shahzebsiddiqui]

@Xiangs18 based on your last PR #1387 which turned out we needed to refactor some of the code-base. I did this basically removing the entry method inspect_cmd and invoke the method directly. This caused issues with regression tests as arguments had to be passed over to several methods such as inspect_cmd -> inspect_list just to invoke a certain test. This also avoids having us to define args.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.13 ⚠️

Comparison is base (2220eeb) 75.08% compared to head (8b1d3c4) 74.95%.

❗ Current head 8b1d3c4 differs from pull request most recent head 5b28edb. Consider uploading reports for the commit 5b28edb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1466      +/-   ##
==========================================
- Coverage   75.08%   74.95%   -0.13%     
==========================================
  Files          57       57              
  Lines        6537     6523      -14     
==========================================
- Hits         4908     4889      -19     
- Misses       1629     1634       +5     

Impacted Files	Coverage Δ
buildtest/cli/inspect.py	96.30% <100.00%> (-2.72%)	⬇️

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