go/lint: forbid print statements in main code and also panic in tests

[adamdecaf]

Two changes in this PR:

• Forbid print statements in main code (but allowed in tests)
• Allow panic in tests, but keep them forbidden in main code

[adamdecaf]

fmt.Fprint* should still be allowed as that's used for formatting complex rows of text.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (43164af) 78.37% compared to head (48f4a20) 78.37%.
Report is 10 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #278   +/-   ##
=======================================
  Coverage   78.37%   78.37%           
=======================================
  Files           1        1           
  Lines          37       37           
=======================================
  Hits           29       29           
  Misses          4        4           
  Partials        4        4           

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[adamdecaf]

@InfernoJJ I added GOLANGCI_ALLOW_PRINT to disable the printf linter on projects like platform-dev where they're helpful.