Remove default_from_api from certificateId field

[modular-magician]

Remove default_from_api=true property from certificateId field in ManagedSslCertificate resource

The field is marked as default_from_api=true and output=true at the same time. default_from_api property takes precedence and hence the field is marked as Optional + Computed which is not correct as the field shouldn't be optional.

This issue has a small impact in TF behavior because it will probably allow customers to modify the field, but the impact should be minor as probably the API will reject modifying an output only field + I don't believe customers will modify it anyways.

Also according to #15585, setting default_from_api=true made config connector position the field in spec section (which should contain only modifiable fields), though I see that the field currently is placed properly.

Anyways, as long as this is a breaking change, we would prefer to fix it now to avoid any future hassle.

Fixes: hashicorp/terraform-provider-google#15585
b/312432901

Release Note Template for Downstream PRs (will be copied)

compute: stopped the `certifcate_id` field in `google_compute_managed_ssl_certificate` resource being incorrectly marked as a user-configurable value when it should just be an output.

Derived from GoogleCloudPlatform/magic-modules#11409