Fix info/warn print of checks

[kellertuer]

As we noticed in Manifolds.jl/#702 sometimes errors printed on info/warn errored themselves

This was due to a “hardcoded” print using e.val and e.msg which not all errors might have.

This PR fixes that by using showerror instead, which errors should implement anyways.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (65780dc) 99.96% compared to head (5ded609) 99.96%.
Report is 1 commits behind head on master.

❗ Current head 5ded609 differs from pull request most recent head 034c08c. Consider uploading reports for the commit 034c08c to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #182   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          27       27           
  Lines        3093     3107   +14     
=======================================
+ Hits         3092     3106   +14     
  Misses          1        1           

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