feat(issue-platform): Allow assignee to be passed with the occurrence

[wedamija]

We want to allow issue platform customers to specify who should be assigned to the issues created from their occurrences. This assignee will only be used when creating a new issue, it won't change the assignee of an existing issue.

Assignees can be team or user. We already have a format for passing this via the API, so I'm using this here too. The Actor format (separate from the Actor model which is being removed) allows us to specify the assignee in a structured way. The format is defined here:

sentry/src/sentry/utils/actor.py

Lines 41 to 47 in ef66c63

	Forms `actor_identifier` can take:
	1231 -> look up User by id
	"1231" -> look up User by id
	"user:1231" -> look up User by id
	"team:1231" -> look up Team by id
	"maiseythedog" -> look up User by username
	"maisey@dogsrule.com" -> look up User by primary email

[JoshFerge]

lgtm. is there a way to add a more e2e test that confirms behavior that the issue created by the issue platform then has a correct assignee?

[JoshFerge]

lgtm. is there a way to add a more e2e test that confirms behavior that the issue created by the issue platform then has a correct assignee?

ah i see your slack messsage, it is just passing in assignee, not doing anything with it.

[wedamija]

lgtm. is there a way to add a more e2e test that confirms behavior that the issue created by the issue platform then has a correct assignee?

ah i see your slack messsage, it is just passing in assignee, not doing anything with it.

Yeah, I'll add a comprehensive test to IssueOccurrenceProcessMessageTest once I make the behaviour work