🌱 disable more style linters for test files

[spencerschrock]

What kind of change does this PR introduce?

linter update

• PR title follows the guidelines defined in our pull request documentation

What is the current behavior?

Test writers need to either satisfy the linter, workaround the linter, or add a nolint directive. For something that's more or less a style decision in tests, this is bad. See #3688 (comment)

What is the new behavior (if this is a feature change)?**

These linters are disabled, as really they're stylistic, and not important in tests. This is to some extent a followup of #2844, which disabled some already.

• lll
• goerr113
• wrapcheck

I also fixed a few unrelated linter warnings because it was easier to just fix the problem than add an exception because they weren't widespread:

• a few instances of errcheck
• one test which gosec complained about file permissions
• an un-needed type conversion for unconvert

• Tests for the changes have been added (for bug fixes/features)

Which issue(s) this PR fixes

NONE

Special notes for your reviewer

When evaluating what linters to disable, I just counted what nolint directives are used in test files and targeted the big ones.

Note: we can't disable govet, because some of what it catches is important (see #2844 (comment))

grep -oinr --include \*_test.go -E "//nolint:[^ ]*" | cut -d ":" -f 4 | sort | uniq -c | sort -n
      1 lll,gocritic
      1 lll,govet
      1 nestif
      1 tparallel,paralleltest
      1 unconvert
      1 wrapcheck,lll
      2 gosec
      2 govet,goerr113
      3 govet,lll
      4 staticcheck
      5 wrapcheck
      8 gocognit
      9 errcheck
     23 paralleltest
     33 goerr113
     35 stylecheck
     44 lll
    142 govet

Does this PR introduce a user-facing change?

For user-facing changes, please add a concise, human-readable release note to
the release-note

(In particular, describe what changes users might need to make in their
application as a result of this pull request.)

[codecov]

Codecov Report

Merging #3707 (4ee7114) into main (4d1621b) will decrease coverage by 7.67%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3707      +/-   ##
==========================================
- Coverage   76.35%   68.69%   -7.67%     
==========================================
  Files         210      210              
  Lines       14395    14395              
==========================================
- Hits        10991     9888    -1103     
- Misses       2757     3934    +1177     
+ Partials      647      573      -74     

[justaugustus]

Thanks @spencerschrock!