build: restore mistakenly dropped suites

suites dropped during the last commit by a typo
restore $(CI_JS_SUITES) to test-ci-js
restore $(CI_NATIVE_SUITES) for `test-ci`
and var assignment tweak

PR-URL: https://github.com/nodejs/node/pull/16132
Fixes: https://github.com/nodejs/node/issues/16129
Fixes: https://github.com/nodejs/build/issues/910


Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Benjamin E. Coe <ben@npmjs.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>