feat(1769): [3] Modify webhook plugin to use queue webhook

[yk634]

Context

This is the implementation that follows #2622.
I modify the webhook plugin to POST the webhook received from SCM to the queue service endpoint /v1/queue/message?type=webhook when queueWebhookEnabled is true.

Objective

• Add queueWebhookEnabled to config so that users can choose whether or not to queue the webhook.
• Add an object queueWebhook to server.app so that the following items can be used from the plugins.
  • Whether or not to use the queueWebhook set in config.
  • An instance of the executor plugin.
• Make the executor.enqueueWebhook method to POST to /v1/queue/message?type=webhook to be executed according to the queueWebhookEnabled setting.

References

Please do not merge this PR until after the following PRs have been merged.

• feat(1769): [1] Add enqueueWebhook method for queue-service cooperation executor-base#77
• feat(1769): [2] Add _enqueueWebhook method for queue-service cooperation executor-queue#99

#1769 (comment)

License

I confirm that this contribution is made under a BSD license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[coveralls]

Coverage increased (+0.003%) to 95.488% when pulling 60e01ae on sonic-screwdriver-cd:use-queue-webhooks into dc76d77 on screwdriver-cd:master.

[ibu1224]

LGTM

[wahapo]

This PR is included in version 4.1.185

The release is available on:

• docker hub
• GitHub release