[rush] Add support for subspaces in rush check

[william2958]

Summary

Currently the "rush check" command does not support subspace scoping, rather running for the entire monorepo at once. This MR adds the --subspace CLI parameter to the rush check command.

Details

How it was tested

Tested by running rush change --subspace default in a subspace enabled monorepo.

Impacted documentation

This MR impacts the following documentation, as their CLI parameters have changed: https://rushjs.io/pages/commands/rush_check/ https://rushjs.io/pages/commands/rush_version/

[octogonz]

This change requires updating the website docs. You don't need to do the work, but your PR needs to let us know. (Filling out that section is supposed to automatically open a GitHub issue in the docs repo.)