Backport #6493 (#6498)

Adds telemetry for custom_node_count tracking on run button clicked as
well.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6498-Backport-6493-29e6d73d365081f88deae824af05c278)
by [Unito](https://www.unito.io)

Author: benceruleanlu

src/platform/telemetry/providers/cloud/MixpanelTelemetryProvider.ts

@@ -313,6 +313,7 @@ export class MixpanelTelemetryProvider implements TelemetryProvider {
         subscribe_to_run: options?.subscribe_to_run || false,
         workflow_type: 'custom',
         workflow_name: 'untitled',
+        custom_node_count: 0,
         total_node_count: 0,
         subgraph_count: 0,
         has_api_nodes: false,
@@ -327,6 +328,7 @@ export class MixpanelTelemetryProvider implements TelemetryProvider {
       subscribe_to_run: options?.subscribe_to_run || false,
       workflow_type: executionContext.is_template ? 'template' : 'custom',
       workflow_name: executionContext.workflow_name ?? 'untitled',
+      custom_node_count: executionContext.custom_node_count,
       total_node_count: executionContext.total_node_count,
       subgraph_count: executionContext.subgraph_count,
       has_api_nodes: executionContext.has_api_nodes,

src/platform/telemetry/types.ts

@@ -43,6 +43,7 @@ export interface RunButtonProperties {
   workflow_type: 'template' | 'custom'
   workflow_name: string
   total_node_count: number
+  custom_node_count: number
   subgraph_count: number
   has_api_nodes: boolean
   api_node_names: string[]