update bigquery routineType to required as per GCP docs

[MrwanBaghdad]

Update bigquery routineType to required fixing bug reported here

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 type parameter type mismatch on routineType for `google_bigquery_routine` 

[modular-magician]

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[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Breaking Change(s) Detected

The following breaking change(s) were detected within your pull request.

• Field routine_type changed from optional to required on google_bigquery_routine - reference

If you believe this detection to be incorrect please raise the concern with your reviewer. If you intend to make this change you will need to wait for a major release window. An override-breaking-change label can be added to allow merging.

Diff report

Your PR generated some diffs in downstreams - here they are.

Terraform GA: Diff ( 2 files changed, 12 insertions(+), 12 deletions(-))
Terraform Beta: Diff ( 2 files changed, 12 insertions(+), 12 deletions(-))
TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2423
Passed tests 2168
Skipped tests: 253
Failed tests: 2

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccFirebaserulesRelease_BasicRelease|TestAccCloudfunctions2function_cloudfunctions2BasicGcsExample

[modular-magician]

Tests passed during RECORDING mode:
TestAccFirebaserulesRelease_BasicRelease[Debug log]

Tests failed during RECORDING mode:
TestAccCloudfunctions2function_cloudfunctions2BasicGcsExample[Error message] [Debug log]

Please fix these to complete your PR
View the build log or the debug log for each test

[roaks3]

Superseded by #8573