Make it possible to create Investigation Bias with has:profile.id

[matejminar]

Users would like to create Investigation Biases (reservoir rules that boost Dynamic Sampling to 100%) with the condition containing has:profile.id. This ticket is about the Relay part that's needed in order for this to happen.
Jan mentioned that we don't have profile.id exposed as a queryable field, actually, it's not a field at all.

[jjbayer]

We currently have the profile ID as a field on contexts.profile.profile_id, but

1. It's set in process_profiles, which happens after dynamic sampling.
2. (easy part) There is no getter for it yet.

relay/relay-server/src/actors/processor.rs

Line 1191 in d19ec3a

profile_id: Annotated::new(profile_id),

relay/relay-event-schema/src/protocol/event.rs

Lines 724 to 727 in d19ec3a

	"contexts.unreal.crash_type" => match self.contexts.value()?.get_key("unreal")? {
	super::Context::Other(context) => context.get("crash_type")?.value()?.into(),
	_ => return None,
	},