[CI] sys tests for nodejs

[tobil4sk]

sys api tests are currently not run for nodejs (as this is not a sys target by default).
They now have been added.

These can be added for nodejs, however, there exist the following limitations:

• sys.io.File.update() is not present in the hxnodejs api
• eof checks work differently in hxnodejs compared to other targets
• On unix, hxnodejs's FileSystem.absolutePath("c:\filepath") returns "/path/to/cwd/c:\filepath", whereas on other Haxe targets it just returns "c:\filepath"
• sys.io.Process does not exist in hxnodejs
• sys.net.Socket.bind() is not implemented in hxnodejs
• The test for sys.io.File.append() fails on Mac

I created hxnodejs PRs to fix the first three:

• Add update method to File api hxnodejs#180
• Fix behaviour of FileInput.eof() hxnodejs#181
• Fix sys.FileSystem.absolutePath hxnodejs#182

For the rest, the tests can temporarily be removed for nodejs using conditional compilation, and they can be added back later when/if the APIs are updated.

[tobil4sk]

Most of the tests are now enabled since #10437, just apart from those broken by the last three things mentioned in the checklist in the original post. These have been disabled temporarily via conditional compilation.