This PR activates the limit for API token creation in both the global
API token window and in the project-level API token tab.
Because the same button is used in two places, I encapsulated the
fetching of flags and resource limits within the button. I can be
convinced to pass the current API token count and the limit as
arguments, but I think this is the right solution for this case.
## About the changes
This PR enables or disables create API token button based on the
permissions.
**Note:** the button is only displayed if you have READ permissions on
some API token. This is a minor limitation as having CREATE permissions
should also grant READ permissions, but right now this is up to the user
to set up the custom role with the correct permissions
**Note 2:** Project-specific API tokens are also ruled by the
project-specific permission to create API tokens in a project (just
having the root permissions to create a client token or frontend token
does not grant access to create a project-specific API token). The
permissions to access the creation of a project-specific API token then
rely on the root permissions to allow the user to create either a client
token or a frontend token.
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Co-authored-by: David Leek <david@getunleash.io>
