resource/cloudflare_origin_ca_certificate: trigger a replacement when csr is changed

[peruzzof]

As commented in the #1007, this is the proposed fix.
I ran some tests with the provided terraform and it works as expected

Closes #1007

[github-actions]

changelog detected ✅

[peruzzof]

Just a note that most probably the Update function that was removed per error during the test must return after the change in the #2048 . So after you approve one I will need to check the second one

[jacobbednarz]

thanks @peruzzof. for the UpdateContext method, i would say we'll need to leave it in place but only update the methods we expect to change without a new resource being created.

[github-actions]

This functionality has been released in v3.29.0 of the Terraform Cloudflare Provider.

Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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