[modular-magician]

Adds ANY_TABLE to google_bigquery_routine.arguments.argument_kind so Terraform can define table-valued functions that accept a table without a fixed schema. BigQuery already supports this argument kind, but the provider's enum validation currently rejects it. See the BigQuery API reference and table parameter documentation.

Adds a generated documentation example and acceptance coverage for creation with ANY_TABLE, in-place updates to FIXED_TABLE and back, and verified import after each step. Also clarifies that data_type is required for FIXED_TYPE arguments.

Verification

• Generated both GA and beta providers; reviewed the generated schema, documentation, and acceptance test.
• make build passed in both generated providers, including formatting checks and go vet ./....
• make testnolint TEST=./google/services/bigquery and make testnolint TEST=./google-beta/services/bigquery passed with TF_ACC unset.
• Offline terraform validate passed using the freshly built GA provider with argument_kind = "ANY_TABLE" and both data_type and table_type omitted.
• MMv1, internal tool, and magician Go unit tests, YAML lint, and new-template checks passed.
• The broader pre-generation script fails in the existing Python test test_extract_gcs_links_from_issue_beta_in_test_name; the identical failure reproduces on untouched upstream commit 6fe4e0b0bfa86386665285edabc10c0dd8eb37e1.
• Live acceptance tests were not run locally; BigQuery create/update/import behavior remains for upstream acceptance CI.

Release Note Template for Downstream PRs (will be copied)

bigquery: added support for `ANY_TABLE` in `arguments.argument_kind` on `google_bigquery_routine`

Derived from GoogleCloudPlatform/magic-modules#19417