fix: default konnect url with konnect addr flag not accounted for.

[Prashansa-K]

Previously, if a deck command was issued with --konnect-addr flag but with the default konnectUrl https://us.api.konghq.com, the flag value was getting ignored as deck could not figure out if it was passed by flag or not. This change ensures that if the flag is set, deck commands are issued against Konnect.

Fixes: #1385

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 29.08%. Comparing base (a50b695) to head (4cacba6).

Files with missing lines	Patch %	Lines
cmd/common.go	0.00%	2 Missing ⚠️
cmd/root.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1398      +/-   ##
==========================================
- Coverage   29.16%   29.08%   -0.08%     
==========================================
  Files          59       59              
  Lines        5211     5215       +4     
==========================================
- Hits         1520     1517       -3     
- Misses       3583     3589       +6     
- Partials      108      109       +1     

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[pmalek]

Ideally we'd add a test to for that if possible but I'm not sure how realistic it is given that we rely on package level variables and adding tests (in this PR) could require a fair amount of refactoring.

Please add a changelog entry for this.