PIPE-4172 Add trigger_event.create audit log event

[liamclarkedev]

Description

A new audit log event is emitted for all pipelines containing information relevant to that trigger event.

Reasons

A link to a GitHub and/or JIRA issue (if applicable). Otherwise, a brief sentence about why you made these changes.

Some existing events currently contain trigger event information in the payload column, this data is now deprecated and will soon be removed. The replacement of any usage of the trigger event information is to use this new event.

https://circleci.com/changelog/audit-log-event-changes-coming-in-30-days/

Content Checklist

Please follow our style when contributing to CircleCI docs. Our style guide is here: https://circleci.com/docs/style/style-guide-overview.

Please take a moment to check through the following items when submitting your PR (this is just a guide so will not be relevant for all PRs) 😸:

• [ ] Break up walls of text by adding paragraph breaks.
• [ ] Consider if the content could benefit from more structure, such as lists or tables, to make it easier to consume.
• [ ] Keep the title between 20 and 70 characters.
• [ ] Consider whether the content would benefit from more subsections (h2-h6 headings) to make it easier to consume.
• [ ] Check all headings h1-h6 are in sentence case (only first letter is capitalized).
• [ ] Is there a "Next steps" section at the end of the page giving the reader a clear path to what to read next?
• [ ] Include relevant backlinks to other CircleCI docs/pages.

[liamclarkedev]

Closing this, will reopen closer to the time of the change.