refactor(billing): clean up unused dialog data and HTML comment

apps/web/src/app/billing/individual/upgrade/premium-org-upgrade-dialog/premium-org-upgrade-dialog.component.html

@@ -1,4 +1,3 @@
-<!-- Premium-to-Organization upgrade flow: User already has premium personally and is upgrading to Teams/Enterprise -->
 @if (step() == PlanSelectionStep) {
   <app-premium-org-upgrade
     (planSelected)="onPlanSelected($event)"

apps/web/src/app/billing/individual/upgrade/premium-org-upgrade-dialog/premium-org-upgrade-dialog.component.spec.ts

@@ -78,7 +78,6 @@ describe("PremiumOrgUpgradeDialogComponent", () => {
     account: mockAccount,
     initialStep: null,
     selectedPlan: null,
-    planSelectionStepTitleOverride: null,
   };
 
   /**