Add error_tag util to the ui module

[QMalcolm]

resolves #107

Description

In dbt-labs/dbt-core#9886 we found that we needed an error_tag function. Because it didn't exist in dbt-common, we added it to core temporarily as a stop gap. This PR gets it added to dbt-common so core can remove the stop gap.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.79%. Comparing base (05c24e4) to head (4e336d0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   55.60%   55.79%   +0.19%     
==========================================
  Files          50       50              
  Lines        3070     3072       +2     
==========================================
+ Hits         1707     1714       +7     
+ Misses       1363     1358       -5     

Flag	Coverage Δ
unit	55.79% <100.00%> (+0.19%)	⬆️

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[emmyoop]

🚀