Misc CI improvements

[dagardner-nv]

Description

• Fetch git tags when performing documentation builds. Allowing for the version number to appear properly in the generated documentation. This should allow for us to publish the documentation build from CI when performing a release.
• Allow overriding the GIT_URL, useful when performing CI against a commit/branch/tag that exists in a remote other than origin
• Replace list of CUDA architectures with RAPIDS place-holder (we were building for 60 even though we no longer support it)
• Construct the CMAKE_BUILD_ALL_FEATURES var in a more readable way
• Allow overriding the build dir, useful for local builds using USE_HOST_GIT=1 to avoid conflicting with a potentially existing build directory
• Move generated env.yaml to $WORKSPACE_TMP, prevents the file from being written to the root of the git repo.
• Rather than init submodules in each stage by hand, use the submodules flag in the checkout action

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

[dagardner-nv]

/merge