Added helpful error responses to webhook test notifications

[JL102]

When a webhook test notification fails, the alert div below the button will now give more specific errors.

Description

I modified apidocs_webhooks.html to display all errors in the alert div below the button instead of using alert() for some, and I modified apidocs.py to send JSON responses for specific errors, e.g. invalid or not specified match keys.

Motivation and Context

Unfortunately this still doesn't help with the CSRF Expired error that occurs on the TBA prod site, since the error object from a failed authentication call returns HTML, and it'd be unsafe to set the HTML inside the alert div from a web response. However, this will help in the case where there's an error inside apidocs.py apidocs_webhooks_notification function.

How Has This Been Tested?

Tested by putting valid and invalid match / event keys into the webhook testing page.

Screenshots (if appropriate):

Example error message: (on my local database, I don't have events from 2014, so it shows a 'not found')

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change API specifications or require data migrations)

[fangeugene]

Sorry this got overlooked earlier this season. This is amazing thanks so much

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 92.88%. Comparing base (24652da) to head (2418329).
Report is 189 commits behind head on py3.

Files	Patch %	Lines
src/backend/web/handlers/apidocs.py	72.72%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              py3    #5822      +/-   ##
==========================================
- Coverage   93.10%   92.88%   -0.23%     
==========================================
  Files         658      656       -2     
  Lines       42145    42580     +435     
  Branches       60       60              
==========================================
+ Hits        39241    39551     +310     
- Misses       2896     3021     +125     
  Partials        8        8              

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