feat: Adjust AWS payment settings

[kyle-ssg]

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Changes

For AWS subscribers:

• Don't show any chargebee related items.
• Lock the seat limit to the number in the subscription (i.e. disable autoseats)

How did you test this code?

Please describe.

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[github-actions]

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[matthewelwell]

@kyle-ssg is there any reason from your side that this is still draft? Seems finished to me.

[kyle-ssg]

Should be good to go

[matthewelwell]

@kyle-ssg I'm not sure how to test this. I've created an organisation in the Uffizzi environment but I'm not seeing anything related to payments in the organisation settings. I guess it's related to the fact that Uffizzi thinks it's a self hosted environment, but even if I enable the payments_enabled in the staging environment (which I assume Uffizzi is using by default), I still don't see anything related to payments.