omit informational message if machine-parseable output has been requested

[bobcallaway]

Fixes: #1395

[codecov]

Codecov Report

Merging #1486 (9487208) into main (3282e1a) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1486      +/-   ##
==========================================
+ Coverage   64.33%   64.36%   +0.03%     
==========================================
  Files          80       80              
  Lines        7789     7790       +1     
==========================================
+ Hits         5011     5014       +3     
+ Misses       2129     2127       -2     
  Partials      649      649              

Flag	Coverage Δ
e2etests	48.22% <100.00%> (+<0.01%)	⬆️
unittests	44.67% <0.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
cmd/rekor-cli/app/search.go	58.15% <100.00%> (+0.29%)	⬆️

... and 2 files with indirect coverage changes

[haydentherapper]

Does this issue exist in rekor-CLI get? If so, we should leave the ticket open

[bobcallaway]

Does this issue exist in rekor-CLI get? If so, we should leave the ticket open

If I use --format=json on rekor-cli get, I don't see the behavior reported in #1395 - the default format isn't meant to be machine-parseable.