fix: error alerts js crash

[etr2460]

SUMMARY

When template params are malformed in sql lab, we return an error from the backend that doesn't include an error level. This caused the frontend to crash

I think this was likely caused by #16917 or #16852, but i don't have enough context on the backend right now to resolve it there. I figure we should also harden the frontend to handle this case, so i added the check there. @ofekisr, could you follow up your PR and ensure that all errors you pass from the backend contain an ErrorLevel? We have helper functions to construct those errors, so it shouldn't be too difficult

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

CI, write a query with a malformed jinja template param and see the error properly

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

to: @rusackas @pkdotson @graceguo-supercat @michael-s-molina

[michael-s-molina]

Thanks for the additional checks!

[codecov]

Codecov Report

Merging #17015 (3d55524) into master (5f73ca8) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #17015   +/-   ##
=======================================
  Coverage   76.93%   76.94%           
=======================================
  Files        1030     1030           
  Lines       55085    55088    +3     
  Branches     7477     7480    +3     
=======================================
+ Hits        42382    42385    +3     
  Misses      12452    12452           
  Partials      251      251           

Flag	Coverage Δ
javascript	70.90% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...nd/src/components/ErrorMessage/BasicErrorAlert.tsx	100.00% <100.00%> (ø)
...rontend/src/components/ErrorMessage/ErrorAlert.tsx	94.44% <100.00%> (+0.21%)	⬆️

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[ofekisr]

@etr2460 yeah...
Please open a slack channel regarding sqllab issues and tag me with all the details you can send, I'll check it tomorrow