Revert "Fix parent project id handling" in BigQuery

[pajaks]

Description

Reverts changes made by: #23041 which caused regression is required permissions.

After mentioned change jobs started to run on data project instead of previously parent project.
Running jobs required BigQuery Job User (bigquery.jobs.create) permissions and in many setups such permissions can be added only on parent project level.

Release notes

(x) This is not user-visible or is docs only, and no release notes are required.

[pajaks]

@ebyhr Could yo run with secretes?

[ebyhr]

/test-with-secrets sha=a0cda61fcc7e39a2395a18b13281d14c9756d32f

[github-actions]

The CI workflow run with tests that require additional secrets finished as failure: https://github.com/trinodb/trino/actions/runs/12232657383

[pajaks]

CI failure seems unrelated:
test (plugin/trino-iceberg -> TestIcebergV2.testEnvironmentContext
Run with secret failed with on plugin/trino-bigquery with error looks flaky:

Error:  io.trino.plugin.bigquery.TestBigQueryAvroConnectorTest.testBigQueryMaterializedView -- Time elapsed: 12.11 s <<< ERROR!
java.lang.IllegalStateException: No valid spans, queries were executing concurrently

@ebyhr Could you rerun?