chore(issue-platform): Default projects to create via the issue platf…

…orm (#48642)

Getting this pr ready so that we can merge once we're happy with testing
in specific orgs.

src/sentry/issues/utils.py

@@ -32,7 +32,7 @@ def issue_category_can_create_group(category: GroupCategory, project: Project) -
             # system-wide option
             and options.get("performance.issues.create_issues_through_platform", False)
             # more-granular per-project option
-            and project.get_option("sentry:performance_issue_create_issue_through_platform", False)
+            and project.get_option("sentry:performance_issue_create_issue_through_platform", True)
         )
     )