Fix limitation preventing to declare create and show routes from the list view

[slax57]

Problem

If a resource declares both a list view and an edit view

<Resource name="posts" list={PostList} edit={PostEdit} />

Then it's impossible to declare other routes (such as the create or show routes) from within the list view, because they overlap with the route declared for the edit view.

This prevents notably from being able to use a CreateDialog with a regular Edit view.
Hence this note in the EE doc:

Note: You can't use the <CreateDialog> and have a standard <Edit> specified on your <Resource>, because the <Routes> declarations would conflict. If you need this, use the <CreateInDialogButton> instead.

Solution

Do not register the edit route if the location matches the create route or the show route.

How To Test

• unit tests
• stories
  • http://localhost:9010/?path=/story/ra-core-core-resource--basic
  • http://localhost:9010/?path=/story/ra-core-core-resource--only-list
  • http://localhost:9010/?path=/story/ra-core-core-resource--with-all-dialogs
  • http://localhost:9010/?path=/story/ra-core-core-resource--with-create-dialog
  • http://localhost:9010/?path=/story/ra-core-core-resource--with-show-dialog
• Also http://localhost:9010/?path=/story/react-admin-resource--nested to make sure nested routes still work too
• And basepath:
  • http://localhost:9010/?path=/story/react-admin-admin--inside-router
  • http://localhost:9010/?path=/story/react-admin-admin--sub-path

Additional Checks

• The PR targets master for a bugfix or a documentation fix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

Also, please make sure to read the contributing guidelines.

[djhi]

Awesome stories, great job!