fix: run Spark integration tests on all branches

Removed branch restrictions from workflow triggers.
Now the tests will run on ANY branch when relevant files change:
- test/java/spark/**
- other/java/hdfs2/**
- other/java/hdfs3/**
- other/java/client/**
- workflow file itself

This fixes the issue where tests weren't running on feature branches.

.github/workflows/spark-integration-tests.yml

@@ -2,7 +2,6 @@ name: Spark Integration Tests
 
 on:
   push:
-    branches: [ master, main ]
     paths:
       - 'test/java/spark/**'
       - 'other/java/hdfs2/**'
@@ -10,7 +9,6 @@ on:
       - 'other/java/client/**'
       - '.github/workflows/spark-integration-tests.yml'
   pull_request:
-    branches: [ master, main ]
     paths:
       - 'test/java/spark/**'
       - 'other/java/hdfs2/**'