improve big query job error messages

[modular-magician]

• add validation to check if project_id and dataset_id are set,
• return descriptive error when the either variable is not set.

Fixes hashicorp/terraform-provider-google#19834

bigquery: added descriptive validation errors for missing required fields in `google_bigquery_job` destination table configuration

Derived from GoogleCloudPlatform/magic-modules#12157

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

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