CDS extractor index-files.sh compile to stdout

Attempt to resolve unit test failures for PR #170 of the
`advanced-security/codeql-sap-js` repo.

Updates the (soon to be replaced) shell-based version of the CDS
extractor as an attempted workaround for a change in cds compiler
behavior when the `-o` or `--dest` options are set for the `cds compile`
CLI command. Forces the cds compmiler to output to the desired .cds.json
file path via stdout.

Author: data-douser

extractors/cds/tools/index-files.sh

@@ -51,8 +51,11 @@ echo "Processing CDS files to JSON"
 # Run the cds compile command on each file in the response file, outputting the compiled JSON to a file with
 # the same name
 while IFS= read -r cds_file; do
-    echo "Processing CDS file $cds_file to:"
-    if ! $cds_command compile "$cds_file" -2 json -o "$cds_file.json" --locations 2> "$cds_file.err"; then
+    echo "Processing CDS file $cds_file to: $cds_file.json"
+    # Avoid using the `-o` (or `--dest`) option as it sends output to a new directory, where we want to
+    # output to a file in the same directory as the input file but with a .json extension.
+    if ! $cds_command compile "$cds_file" -2 json --locations > "$cds_file.json" 2> "$cds_file.err"
+    then
         stderr_truncated=`grep "^\[ERROR\]" "$cds_file.err" | tail -n 4`
         error_message=$'Could not compile the file '"$cds_file"$'.\nReported error(s):\n```\n'"$stderr_truncated"$'\n```'
         echo "$error_message"