[GR-39151] Rename the Graal.js installable.

PullRequest: js/2485

Author: ansalond

graal-js/mx.graal-js/mx_graal_js.py

@@ -339,6 +339,7 @@ def is_included(path):
     suite=_suite,
     name='Graal.js',
     short_name='js',
+    installable_id='javascript',
     standalone_dir_name='graaljs-<version>-<graalvm_os>-<arch>',
     standalone_dependencies={
         'GraalVM license files': ('', ['GRAALVM-README.md']),