Update Dataproc WorkflowTemplate, rename REQUIRED_OVERRIDE

[rileykarson]

Changes the name of REQUIRED_OVERRIDE to CUSTOM_SCHEMA_VALUES as that makes a little more sense (it applies to more than required) and removes the ForceNew value since it wasn't hooked up anywhere.

This updates the Dataproc WorkflowTemplate resource, fixing the version field retyping that was otherwise blocking #5197. I deprecated it- not sure if it's on the docket for 4.0.0, I haven't rolled it in yet (we already have enough to do)

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)

dataproc: deprecated the `google_dataproc_workflow_template.version` field, as it wasn't actually useful. The field is used during updates, but updates aren't currently possible with the resource.

[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, 110 insertions(+), 65 deletions(-))
Terraform Beta: Diff ( 2 files changed, 101 insertions(+), 69 deletions(-))

[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, 110 insertions(+), 65 deletions(-))
Terraform Beta: Diff ( 1 file changed, 100 insertions(+), 68 deletions(-))

[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, 103 insertions(+), 52 deletions(-))
Terraform Beta: Diff ( 1 file changed, 93 insertions(+), 55 deletions(-))

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccDataprocWorkflowTemplate_basic|TestAccNetworkServicesEdgeCacheOrigin_networkServicesEdgeCacheOriginAdvancedExample|TestAccNetworkServicesEdgeCacheService_networkServicesEdgeCacheServiceAdvancedExample You can view the result here: https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=207918

[slevenick]

Great rename! Looks reasonable assuming the dataproc test passes

[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, 103 insertions(+), 52 deletions(-))
Terraform Beta: Diff ( 1 file changed, 93 insertions(+), 55 deletions(-))