Improve saved object Copy/Share flyouts when no spaces exist

[jportner]

Currently, if you Copy/Share a saved object and no spaces exist, you get an unhelpful message.

See screenshots

We should change both flyouts:

• If the user is authorized to create new spaces, change the text to: "There are no eligible spaces to <copy | share> into. Create a space first."
  • (link to <basepath>/app/management/kibana/spaces/create)
• If the user is not authorized to create new spaces, change the text to "There are no eligible spaces to <copy | share> into. You do not have permission to create a space."

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)

[gchaps]

Options for when the user is authorized

Create a new space

This is where you'll copy your objects.

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Create a space first

You'll fill this space with your copied objects.

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No spaces available

Create a new space for copying your objects.

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If the user is not authorized

You don't have permission to create a space for your copied objects. Contact your system administrator.

[jportner]

Note: #76132 will partially resolve this (for the "Share to space" flyout only).