fix: avoid while cycle in computeMaxFontSize for big Number run forever when css rule applied

[diegomedina248]

SUMMARY

Adding custom CSS to a dashboard with a bigInt chart would activate a while loop that didn't ever finished, which somehow wasn't caught by the surrounding ErrorBoundary cause the whole app crashed before running out of memory (my guess)

Follow up on #20067, adding the missing titles

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

168395532-ef3dc781-3415-4a76-82fa-23d796395bde.1.mov

TESTING INSTRUCTIONS

1. Create a Dashboard.
2. Access it on edit mode.
3. Click on the three ellipses on the top right corner > Edit CSS.
4. Add below CSS code to it:

.header-line {
  font-size: 170px!important;
}

5. Add a Big Number Chart to the Dashboard.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #20173 (ce547f4) into master (ce547f4) will not change coverage.
The diff coverage is n/a.

❗ Current head ce547f4 differs from pull request most recent head 1e8fa65. Consider uploading reports for the commit 1e8fa65 to get more accurate results

@@           Coverage Diff           @@
##           master   #20173   +/-   ##
=======================================
  Coverage   66.44%   66.44%           
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  Files        1721     1721           
  Lines       64548    64548           
  Branches     6811     6811           
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  Hits        42890    42890           
  Misses      19925    19925           
  Partials     1733     1733           

Flag	Coverage Δ
hive	53.72% <0.00%> (ø)
javascript	51.32% <0.00%> (ø)
mysql	82.14% <0.00%> (ø)
postgres	82.20% <0.00%> (ø)
presto	53.58% <0.00%> (ø)
python	82.63% <0.00%> (ø)
sqlite	81.94% <0.00%> (ø)
unit	49.43% <0.00%> (ø)

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[stephenLYZ]

LGTM!