test: fix flaky test-make-doc

`test-make-doc` fails in CI on Raspberry Pi devices where `test-ci-js`
runs the test but does not build the docs. We do not want to build the
docs in these cases. Move the test to the `doctool` suite and add that
suite to `IGNORED_SUITES` in `test.py`. Specify `doctool` as a test
suite to run with `make test` or `make test-ci` but not with the
`make test-ci-js` job run on cross-compiled fanned CI tests like we do
with Raspberry Pi devices in CI.

PR-URL: https://github.com/nodejs/node/pull/16301


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>