fix: log exceptions for thumbnail generation as warnings

[samtfm]

SUMMARY

Log these exceptions as warnings since thumbnail generation is very error prone on selenium

TEST PLAN

ADDITIONAL INFORMATION

https://sentry.io/organizations/preset-inc/issues/2073254864/?project=1827134

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #13737 (e4a60eb) into master (3e64679) will decrease coverage by 1.34%.
The diff coverage is 53.53%.

❗ Current head e4a60eb differs from pull request most recent head 50c48f0. Consider uploading reports for the commit 50c48f0 to get more accurate results

@@            Coverage Diff             @@
##           master   #13737      +/-   ##
==========================================
- Coverage   77.43%   76.08%   -1.35%     
==========================================
  Files         933      945      +12     
  Lines       47093    48461    +1368     
  Branches     5818     6242     +424     
==========================================
+ Hits        36465    36872     +407     
- Misses      10485    11438     +953     
- Partials      143      151       +8     

Flag	Coverage Δ
cypress	56.02% <28.39%> (-0.48%)	⬇️
hive	?
mysql	80.60% <88.57%> (+0.04%)	⬆️
postgres	80.63% <88.57%> (+0.04%)	⬆️
presto	80.29% <88.57%> (+0.04%)	⬆️
python	80.87% <88.57%> (-0.23%)	⬇️
sqlite	80.19% <88.57%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...rset-frontend/src/SqlLab/components/QueryTable.jsx	66.66% <ø> (ø)
...erset-frontend/src/SqlLab/components/SqlEditor.jsx	56.01% <ø> (ø)
superset-frontend/src/chart/chartReducer.ts	48.59% <ø> (-15.79%)	⬇️
superset-frontend/src/common/components/index.tsx	100.00% <ø> (ø)
...frontend/src/components/Checkbox/CheckboxIcons.tsx	83.33% <ø> (ø)
...frontend/src/components/DatabaseSelector/index.tsx	55.05% <ø> (ø)
...perset-frontend/src/components/FormLabel/index.tsx	100.00% <ø> (ø)
superset-frontend/src/components/Loading/index.tsx	100.00% <ø> (ø)
...rset-frontend/src/components/ProgressBar/index.tsx	16.66% <ø> (ø)
...et-frontend/src/components/TableSelector/index.tsx	85.29% <ø> (+0.37%)	⬆️
... and 117 more

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