make ForceNew on newly added required field

[edwardmedia]

Fixes hashicorp/terraform-provider-google#10379

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)

bigquery: fixed a bug of cannot add required fields to an existing schema on `google_bigquery_table`

[modular-magician]

Hello! I am a robot who works on Magic Modules PRs.

I have detected that you are a community contributor, so your PR will be assigned to someone with a commit-bit on this repo for initial review.

Thanks for your contribution! A human will be with you soon.

@ndmckinley, please review this PR or find an appropriate assignee.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 11 insertions(+))
Terraform Beta: Diff ( 1 file changed, 11 insertions(+))

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 11 insertions(+))
Terraform Beta: Diff ( 1 file changed, 11 insertions(+))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDatasourceGoogleServiceNetworkingPeeredDnsDomain_basic|TestAccContainerCluster_withAuthenticatorGroupsConfig|TestAccContainerNodePool_withWorkloadIdentityConfig|TestAccServiceNetworkingPeeredDNSDomain_basic|TestAccSqlUser_postgresIAM You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=212761

[modular-magician]

Tests failed during RECORDING mode: TestAccContainerCluster_withAuthenticatorGroupsConfig|TestAccSqlUser_postgresIAM Please fix these to complete your PR

[modular-magician]

Hi! I'm the modular magician. Your PR hasn't generated any diffs, but I'll let you know if a future commit does.

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDataSourceGoogleSQLCaCerts_basic|TestAccCloudRunService_cloudRunServiceSqlExample|TestAccComputeFirewallPolicyRule_update|TestAccServiceNetworkingPeeredDNSDomain_basic|TestAccSQLDatabase_sqlDatabaseBasicExample|TestAccSqlDatabaseInstance_basicSecondGen|TestAccSqlDatabaseInstance_basicMSSQL|TestAccSqlDatabaseInstance_settings_basic|TestAccSqlDatabaseInstance_settings_deletionProtection|TestAccSqlDatabaseInstance_slave|TestAccSqlDatabaseInstance_diskspecs|TestAccSqlDatabaseInstance_maintenance|TestAccSqlDatabaseInstance_settings_upgrade|TestAccSqlDatabaseInstance_settingsDowngrade|TestAccSqlDatabaseInstance_authNets|TestAccSqlDatabaseInstance_multipleOperations|TestAccSqlDatabaseInstance_basic_with_user_labels|TestAccSqlDatabaseInstance_withPrivateNetwork|TestAccSqlDatabase_basic|TestAccSqlDatabase_update|TestAccSqlClientCert_mysql|TestAccSqlUser_postgresIAM You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=212955

[modular-magician]

Tests failed during RECORDING mode: TestAccComputeFirewallPolicyRule_update|TestAccSqlUser_postgresIAM|TestAccSqlDatabase_update|TestAccSqlDatabase_basic|TestAccSqlDatabaseInstance_multipleOperations|TestAccSqlDatabaseInstance_authNets|TestAccSqlDatabaseInstance_settingsDowngrade|TestAccSqlDatabaseInstance_basic_with_user_labels|TestAccSqlDatabaseInstance_withPrivateNetwork Please fix these to complete your PR