web/common: utils: fix infinite value handling in getRelativeTime function

[dominic-r]

Closes #13562

Details

REPLACE ME

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Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.68%. Comparing base (868261c) to head (50bfc03).
Report is 101 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13564   +/-   ##
=======================================
  Coverage   92.68%   92.68%           
=======================================
  Files         794      794           
  Lines       40479    40479           
=======================================
+ Hits        37518    37519    +1     
+ Misses       2961     2960    -1     

Flag	Coverage Δ
e2e	47.87% <ø> (ø)
integration	24.28% <ø> (ø)
unit	90.51% <ø> (+<0.01%)	⬆️

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[kensternberg-authentik]

Approved, but I made a suggestion.

[kensternberg-authentik]

"Because coercion inside the isNaN() function can be surprising, you may prefer to use Number.isNaN()."

[dominic-r]

My code doesn't seem to use isNaN at the moment. Sorry if I'd not get what you mean, but do you want me to add a check for NaN or replace part of my patch with a NaN check?

[kensternberg-authentik]

isFinite() uses isNan() under the covers, as the link documents. Although the isFinite() page has the same quote:

"Because coercion inside the isFinite() function can be surprising, you may prefer to use Number.isFinite()."