fix: track .bqrs test input files in before directories

The integration tests for codeql_bqrs_interpret were failing in CI because
the .bqrs files in before/ directories were being ignored by the gitignore
rule (**/*.bqrs). These files exist locally but were not committed, causing
the tests to fail with 'No .bqrs files found'.

Fixed by:
1. Adding an exception to .gitignore for .bqrs files in before/ directories
2. Force-adding the 4 .bqrs test input files that were previously ignored

Author: data-douser

client/integration-tests/.gitignore

@@ -1,2 +1,5 @@
 # Ignore binary query results files in integration tests
 **/*.bqrs
+
+# But allow .bqrs files in before directories (needed as test inputs)
+!**/before/*.bqrs

client/integration-tests/primitives/tools/codeql_bqrs_decode/basic_decode/before/results.bqrs

@@ -0,0 +1,19 @@
+# Sample BQRS file for testing codeql_bqrs_decode
+# This is a mock BQRS file format for integration test purposes
+# In practice, this would be a binary format generated by CodeQL query execution
+
+[BQRS Header]
+Version: 1.0
+ResultSets: 1
+
+[ResultSet 1]
+Name: select
+Columns: 3
+Column0: file (string)
+Column1: line (int) 
+Column2: message (string)
+
+[Data]
+"/example/file1.java",10,"Example result 1"
+"/example/file2.java",25,"Example result 2"
+"/example/file3.java",42,"Example result 3"

client/integration-tests/primitives/tools/codeql_bqrs_info/basic_info/before/results.bqrs

@@ -0,0 +1,19 @@
+# Sample BQRS file for testing codeql_bqrs_info
+# This is a mock BQRS file format for integration test purposes
+# In practice, this would be a binary format generated by CodeQL query execution
+
+[BQRS Header]
+Version: 1.0
+ResultSets: 1
+
+[ResultSet 1]
+Name: select
+Columns: 3
+Column0: file (string)
+Column1: line (int) 
+Column2: message (string)
+
+[Data]
+"/example/file1.java",10,"Example result 1"
+"/example/file2.java",25,"Example result 2"
+"/example/file3.java",42,"Example result 3"