Handle webhook errors

[melohagan]

Description

Fix for invalid webhook URLs crashing automations page.

Addresses:

• [BUDI-6589] Invalid Slack/Discord Webhook URL crashes automation page #9713

Screenshots

Documentation

• I have reviewed the budibase documentatation to verify if this feature requires any changes. If changes or new docs are required I have written them.

[codecov-commenter]

Codecov Report

Merging #9715 (c4b1277) into master (942965d) will decrease coverage by 0.05%.
The diff coverage is 20.00%.

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@@            Coverage Diff             @@
##           master    #9715      +/-   ##
==========================================
- Coverage   57.21%   57.16%   -0.05%     
==========================================
  Files         490      490              
  Lines       16159    16175      +16     
  Branches     2629     2633       +4     
==========================================
+ Hits         9245     9247       +2     
- Misses       4650     4660      +10     
- Partials     2264     2268       +4     

Impacted Files	Coverage Δ
...ackages/server/src/automations/steps/integromat.ts	38.46% <0.00%> (-17.10%)	⬇️
packages/server/src/automations/steps/slack.ts	38.46% <0.00%> (-17.10%)	⬇️
packages/server/src/automations/steps/discord.ts	68.42% <40.00%> (-11.58%)	⬇️
packages/server/src/automations/steps/zapier.ts	76.92% <40.00%> (-23.08%)	⬇️

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[aptkingston]

I was worried that your PR to fix this might conflict with mine, as I've rewritten the majority of automation state handling here: #9714, which includes handling these failures gracefully, but having looked at the code it looks like you've added a fix to the underlying automation steps which is great too, and compliments my other work on that branch.

My PR handles any automation test failures properly which includes this and many other scenarios which bricked the builder, but improving the steps themselves is a great addition as well.