chore(studio): track docs link clicks in the region selector footer (#51841)

Adds `free_tier_general_region_docs_link_clicked` event, fired when the
regions docs link in the selector footer is clicked

apps/studio/components/interfaces/ProjectCreation/RegionSelector.tsx

@@ -403,7 +403,10 @@ export const RegionSelector = ({
                               Upgrade to Pro
                             </InlineLink>{' '}
                             to choose a{' '}
-                            <InlineLink href={`${DOCS_URL}/guides/platform/regions`}>
+                            <InlineLink
+                              href={`${DOCS_URL}/guides/platform/regions`}
+                              onClick={() => track('free_tier_general_region_docs_link_clicked')}
+                            >
                               specific region
                             </InlineLink>
                             .

packages/common/telemetry-constants.ts

@@ -555,6 +555,18 @@ export interface FreeTierGeneralRegionUpgradeClickedEvent {
   groups: Omit<TelemetryGroups, 'project'>
 }
 
+/**
+ * User clicked the "specific region" docs link in the region selector's footer.
+ *
+ * @group Events
+ * @source studio
+ * @page new/{slug} and /integrations/vercel/{slug}/deploy-button/new-project
+ */
+export interface FreeTierGeneralRegionDocsLinkClickedEvent {
+  action: 'free_tier_general_region_docs_link_clicked'
+  groups: Omit<TelemetryGroups, 'project'>
+}
+
 /**
  * User clicked the "Need a specific region?" link to reveal the specific regions
  * list in the project creation region selector.
@@ -4189,6 +4201,7 @@ export type TelemetryEvent =
   | ProjectCreationFormExposedEvent
   | FreeTierGeneralRegionExperimentExposedEvent
   | FreeTierGeneralRegionUpgradeClickedEvent
+  | FreeTierGeneralRegionDocsLinkClickedEvent
   | ProjectCreationSpecificRegionLinkClickedEvent
   | OrganizationCreationFormExposedEvent
   | OrganizationCreationCompletedEvent