Allow tagstore to query issue platform issues

[wedamija]

Currently tagstore works with errors and performance issues. We want to allow it to query any issue platform related issues as well.

This might be the only place we need to touch:

sentry/src/sentry/tagstore/snuba/backend.py

Lines 527 to 536 in c28d9b7

	def apply_group_filters_conditions(self, group: Group, conditions, filters):
	dataset = Dataset.Events
	if group:
	if group.issue_category == GroupCategory.PERFORMANCE:
	dataset = Dataset.Transactions
	apply_performance_conditions(conditions, group)
	else:
	filters["group_id"] = [group.id]
	return dataset, conditions, filters

Probably just need to change the dataset to be the issue platform one if not error/performance.

Should also make sure that we write tests that query the issue platform. There should be examples related to performance issues.

[ceorourke]

Blocked by getsentry/snuba#3571 - someone else can pick this up if they want.