fix: don't hard-require project in contributors_leaderboard when collectionSlug is set

Found by live-verifying the segments_filtered_by_collection deploy against
prod: contributors_leaderboard's is_request_from_non_lf_project node had
its own independent required=True on project (unrelated to segment
scoping, used only to decide displayName vs publicName), which broke
data-mode calls with collectionSlug even though count mode worked. A
collection spans many projects with mixed LF/non-LF status, so
collection-scoped requests now always use displayName.

Signed-off-by: Gašper Grom <gasper.grom@gmail.com>

Author: gaspergrom

services/libs/tinybird/pipes/contributors_leaderboard.pipe

@@ -4,7 +4,8 @@ DESCRIPTION >
     - Calculates contribution counts and percentages, showing different display names based on project type (LF vs non-LF).
     - Primary use case: powering contributor ranking widgets in development insights.
     - Parameters:
-    - `project`: Required string for project slug (e.g., 'k8s', 'tensorflow') - inherited from `segments_filtered`
+    - `project`: Required string for project slug (e.g., 'k8s', 'tensorflow') - inherited from `segments_filtered`. Required unless `collectionSlug` is given.
+    - `collectionSlug`: Collection slug (e.g., 'cncf') - inherited from `segments_filtered_by_collection`. Required unless `project` is given. A collection spans many projects with mixed LF/non-LF status, so the non-LF `publicName` display-name substitution below only applies in single-project mode; collection-scoped requests always use `displayName`.
     - `repos`: Optional array of repository URLs for filtering (inherited from `segments_filtered`)
     - `startDate`: Optional DateTime filter for activities after timestamp (e.g., '2024-01-01 00:00:00')
     - `endDate`: Optional DateTime filter for activities before timestamp (e.g., '2024-12-31 23:59:59')
@@ -39,12 +40,16 @@ SQL >
 NODE is_request_from_non_lf_project
 SQL >
     %
-    SELECT not isLF AS result
-    FROM insightsProjects final
-    WHERE
-        isNull (deletedAt)
-        AND enabled = 1
-        and slug = {{ String(project, description="Filter by project slug", required=True) }}
+    {% if defined(collectionSlug) %}
+        SELECT false AS result
+    {% else %}
+        SELECT not isLF AS result
+        FROM insightsProjects final
+        WHERE
+            isNull (deletedAt)
+            AND enabled = 1
+            and slug = {{ String(project, description="Filter by project slug", required=True) }}
+    {% end %}
 
 NODE contributors_leaderboard_2
 SQL >