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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