vet: various cleanups

[dfawley]

Various vet.sh improvements/cleanups:

• Use staticcheck for pkg comments instead of special code.
• Remove golint use (it is deprecated & very slow).
• Re-add deprecation warnings and update exclusions.
• Add all checkers to staticcheck (e.g. mismatched receivers, underscores).
• Add a manual check for misspelled test functions that prevent running.

And some fixes:

• Mismatched receiver names
• Test function misspelled that prevented it from running
• Duplicate imports

RELEASE NOTES: n/a

[codecov]

Codecov Report

Merging #6780 (afbb0ad) into master (591c481) will decrease coverage by 0.07%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6780      +/-   ##
==========================================
- Coverage   83.35%   83.28%   -0.07%     
==========================================
  Files         285      285              
  Lines       30967    30967              
==========================================
- Hits        25811    25791      -20     
- Misses       4078     4092      +14     
- Partials     1078     1084       +6     

see 18 files with indirect coverage changes

[arvindbr8]

only 2 minor comments;

Also, does vet complain about go.work for you?