Improve Release Failed Webhook Messages

[awsmsrc]

We are incorrectly sending release failed webhooks with a message that says unable to wait for promotion: ResourceNotReady: exceeded 120 wait attempts.

Looking at the aws Waiter source code it returns an error when the stack is in an update failed state, we were not handling this properly and always outputting this error.

This PR

• Increases the waiter 3x to cover observations that a stack can take more than an hour to rollback
• Changes the message include "UPDATE_FAILED", "UPDATE_ROLLBACK_FAILED", "UPDATE_ROLLBACK_COMPLETE" and event status correctly
• adds more info to the error message: message": "release RYSPOEAUOVY failed - [AWS::ECS::Service:ServiceWeb] [UPDATE_FAILED]: Resource update cancelled",

[nzoschke]

QA Checklist

• Create an app
• Deploy an app with a load balancer does an exit 1
• Confirm Release Promote Started and Release Promote Failed webhook and "UPDATE_ROLLBACK_COMPLETE" message

[nzoschke]

Code LGTM

Complete the QA checklist before merge

[codecov]

Codecov Report

Merging #1965 into master will decrease coverage by -0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1965      +/-   ##
==========================================
- Coverage   30.16%   30.15%   -0.02%     
==========================================
  Files         140      140              
  Lines       13986    13995       +9     
==========================================
+ Hits         4219     4220       +1     
- Misses       9323     9331       +8     
  Partials      444      444

Impacted Files	Coverage Δ
api/models/release.go	0% <ø> (ø)	✅
api/models/cronjob.go	86.2% <ø> (+3.44%)	✅

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[awsmsrc]

@MiguelMoll manual QA complete, please review

[MiguelMoll]

lgtm

[awsmsrc]

fixes #1654