refactor: No error return for print

[TerryHowe]

What this PR does / why we need it:

I don't think we should consider print errors a problem most of the time and we should manage the output of the error to print only once.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.81%. Comparing base (101cf17) to head (2acae64).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1375      +/-   ##
==========================================
+ Coverage   84.75%   84.81%   +0.06%     
==========================================
  Files         104      104              
  Lines        3712     3715       +3     
==========================================
+ Hits         3146     3151       +5     
+ Misses        338      336       -2     
  Partials      228      228              

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[qweeah]

If && p.errored == nil is not required, then errored can be removed from the printer like:

// Println prints objects concurrent-safely with newline.
func (p *Printer) Println(a ...any) error {
	p.lock.Lock()
	defer p.lock.Unlock()
	_, err := fmt.Fprintln(p.out, a...)
	if err != nil  {
		err = fmt.Errorf("display output error: %w", err)
		_, _ = fmt.Fprint(os.Stderr, err)
	}
        return err
}

[TerryHowe]

Last commit only contains improved test errors

[qweeah]

LGTM