Event type information in streaming audit event for deploy token

What does this MR do and why?

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

event type names are as follow:

action	event type
creation	deploy_token_created
revoke	deploy_token_revoked
delete	deploy_token_destroyed
creation failed	deploy_token_creation_failed

How to set up and validate locally

1. Create a deploy token from Project -> 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-project-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-project-deploy-token
9. Repeat step 2 and 3
10. Try to Create Deploy token using API https://docs.gitlab.com/ee/api/deploy_tokens.html#create-a-project-deploy-token with empty scopes so that it throws error
11. 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)