fix: hide new library button for ineligible users in split studio view

[kaustavb12]

Description

The user_can_view_create_library_button() function is used to check if the a studio user should be shown the New Library button in Studio.

Currently this works fine in the legacy studio UI, but in the split studio view, users who don't have access to create a library are still shown the New Library button. This creates a confusing user experience since, if such an user tries to create a library, they get an error down the UI flow.

This PR fixes this issue.

As such, this PR does the following:

1. The New Library button is now only shown to eligible users in the split studio view, instead of all active users.
2. Common code between user_can_view_create_library_button() and user_can_create_library() functions are refactored out to a new fuction.

Supporting information

This PR is a companion to openedx/frontend-app-authoring#1216

Testing instructions

1. Setup this PR branch in a local or sandbox environment.
2. Login to studio through a user account without any staff access
3. Access the split studio view ( <Studio_URL>/home_library )
4. Ensure New Library button is missing there.

Other information

Private Ref: BB-9077

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Thanks for the pull request, @kaustavb12!

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2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

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2U Release Notice: This PR has been deployed to the edX production environment.

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2U Release Notice: This PR has been deployed to the edX production environment.

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2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.