Mark replication type computed as it no longer comes back from API

[modular-magician]

Fixes: #7990

This field no longer appears in the API response. This combined with the Default value in Terraform causes Terraform to permadiff on the field. Workaround until an updated provider version is available with

lifecycle {
  ignore_changes = [settings.0.replication_type]
}

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

sql: fixed a bug in `google_sql_database_instance` that caused a permadiff on `settings.replication_type`

Derived from GoogleCloudPlatform/magic-modules#4312

[tarrencev]

Could you please release with this change 👍

[slevenick]

Could you please release with this change 👍

Yup it's released in 3.51.0. We are in the process of updating the changelog, but it should be released as of now

[tarrencev]

thank you!

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!