chore: update activityTypes tinybird datasource

Author: joanagmaia

services/libs/tinybird/datasources/activityTypes.datasource

@@ -3,6 +3,7 @@ DESCRIPTION >
     - `id` is the unique identifier for the activity type record.
     - `activityType` specifies the activity type (issues-opened, pull-request-opened, etc.). Using LowCardinality.
     - `platform` is the platform the activity type applies to (github, gitlab, gerrit, etc.). Using LowCardinality.
+    - `description` provides a human-readable description of what the activity type and platform represents.
     - `isCodeContribution` indicates whether this activity counts as a code contribution.
     - `isCollaboration` indicates whether this activity counts as a collaboration.
     - `createdAt` and `updatedAt` are standard timestamp fields for record lifecycle tracking.
@@ -13,6 +14,7 @@ SCHEMA >
     `id` UUID `json:$.record.id`,
     `activityType` LowCardinality(String) `json:$.record.activityType`,
     `platform` LowCardinality(String) `json:$.record.platform`,
+    `description` String `json:$.record.description`,
     `isCodeContribution` Bool `json:$.record.isCodeContribution`,
     `isCollaboration` Bool `json:$.record.isCollaboration`,
     `createdAt` DateTime64(3) `json:$.record.createdAt`,