Move repo files into subfolder

This is so that the test-db doesn't get moved when all the repo files
are moved, which was causing some problems.

Author: owen-mc

go/ql/integration-tests/linux-only/go/dep-sample/test.expected

@@ -1,4 +1,4 @@
 htmlFiles
 extractionErrors
 #select
-| test.go:0:0:0:0 | test.go |
+| work/test.go:0:0:0:0 | work/test.go |

go/ql/integration-tests/linux-only/go/dep-sample/test.py

@@ -4,4 +4,4 @@
 from create_database_utils import *
 
 os.environ['LGTM_INDEX_IMPORT_PATH'] = "deptest"
-run_codeql_database_create([], lang="go")
+run_codeql_database_create([], lang="go", source="work")