Event type info in group deploy token audit events

What does this MR do and why?

Add event type information in streaming audit event while creation and revoking group deploy token

action	event type
creation	group_deploy_token_created
revoke	group_deploy_token_revoked
delete	group_deploy_token_destroyed
creation failed	group_deploy_token_creation_failed

How to set up and validate locally

1. Create a deploy token from Group -> Settings -> Repository.
2. Check streamed audit event contains correct event type information both in payload and headers.
3. Check audit event is saved in database and is visible at {{base url}}/admin/audit_logs.
4. Revoke a deploy token from UI.
5. Repeat step 2 and 3.
6. Create Deploy token using API https://docs.gitlab.com/ee/api/deploy_tokens.html#create-a-group-deploy-token
7. Repeat step 2 and 3
8. Delete Deploy token using API https://docs.gitlab.com/ee/api/deploy_tokens.html#delete-a-group-deploy-token
9. Repeat step 2 and 3

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #363087 (closed)

changed milestone to %15.3

added Category:Audit Events GitLab Ultimate Next Up devopsmanage groupcompliance priority1 sectiondev typefeature workflowproduction labels

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added backend label

	1 Warning
	Please add a merge request subtype to this merge request.

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Category	Reviewer	Maintainer
backend	Alan (Maciej) Paruszewski (@mparuszewski) (UTC+2, 3.5 hours behind @harsimarsandhu)	Charlie Ablett (@cablett) (UTC+12, 6.5 hours ahead of @harsimarsandhu)

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Generated by Danger

assigned to @harsimarsandhu

changed the description

@m_frankiewicz Could you please review backend

requested review from @m_frankiewicz

removed workflowproduction label

removed Next Up label

approved this merge request

requested review from @tkuah and removed review request for @m_frankiewicz

@m_frankiewicz, thanks for approving this merge request.

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marked the checklist item I have evaluated the MR acceptance checklist for this MR. as completed

Thanks @harsimarsandhu ! I have one question above, though I'm not sure what it does exactly, but seems important :)

Great review @m_frankiewicz !