refactor: Replace 'print' with 'fmt.Print'

[alexandear]

The PR replaces print with normal fmt.Print in the test directory.

print is not guaranteed to stay in the language according to the spec.

These changes are similar to those in #3326.

[gmlewis]

Thank you, @alexandear !
LGTM.
Merging.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.39%. Comparing base (2b8c7fa) to head (5ab40ba).
Report is 153 commits behind head on master.

Files with missing lines	Patch %	Lines
test/fields/fields.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3327      +/-   ##
==========================================
- Coverage   97.72%   93.39%   -4.33%     
==========================================
  Files         153      172      +19     
  Lines       13390    11909    -1481     
==========================================
- Hits        13085    11123    -1962     
- Misses        215      692     +477     
- Partials       90       94       +4     

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