test: check inspector support in test/inspector

When configuring node --without-ssl or --without-inspector these test
will fail. The underlying issue will be:

Inspector support is not available with this Node.js build
/work/nodejs/node/out/Release/node: bad option: --inspect=0

This commit adds checks to see if inspector support is enabled and if
not skips these tests.

PR-URL: https://github.com/nodejs/node/pull/13324


Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Eugene Ostroukhov <eostroukhov@chromium.org>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>