Allow different namespaces in CI for fission-function and fission-builder (#2609)

* Add variables for function/builder namespace in the test
* Allow different namespaces in integration tests

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>
Co-authored-by: Sanket Sudake <sanketsudake@gmail.com>

test/tests/test_annotations.sh

@@ -14,7 +14,7 @@ mkdir -p $tmp_dir
 ENV=python-${TEST_ID}
 RESOURCE_NS=default # Change to test-specific namespace once we support namespaced CRDs
 FUNCTION_NS=${FUNCTION_NAMESPACE:-fission-function}
-BUILDER_NS=fission-builder
+BUILDER_NS=${BUILDER_NAMESPACE:-fission-builder}
 LIST_ANNOTATIONS=go-template='{{range $key,$value := .metadata.annotations}}{{$key}}: {{$value}}{{"\n"}}{{end}}'
 
 # fs