The "js-debug-adapter not available" message and the debug doc only
mentioned Mason and JS_DEBUG_DAP_SERVER, leaving users to try
`npm i -g js-debug-adapter`, which 404s: js-debug-adapter is the omp
adapter id, not an installable package. Surface the supported installs
(Mason; the standalone vscode-js-debug release tarball extracted to
~/.local/opt/js-debug/, which resolveJsDebugServerPath already
auto-discovers; or JS_DEBUG_DAP_SERVER) in both the error message and
docs/tools/debug.md.
Refs #7757.
Franklin Castillo
3afc87926b