Remove ARN Parameter from Firehose DeliveryStream Resource

[blakeromano]

Description of your changes

This removes the ARN parameter from the Firehose DeliveryStream Resource. After a conversation with @mbbush in this thread https://crossplane.slack.com/archives/C05E0UE46S2/p1711042281273589 this is an attribute we should move to status. I also took some time to optimize the way arn's for other resources were referenced

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable to ensure this PR is ready for review.
• [ ] Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

Uptest: https://github.com/crossplane-contrib/provider-upjet-aws/actions/runs/8693667532

[turkenf]

/test-examples="examples/firehose/v1beta1/deliverystream.yaml"