Fix Google Cloud Batch error messages to include job name

[parkhojeong]

Add missing f-string prefixes so Cloud Batch errors display the actual job
name instead of {job_name}.

• f"Batch job with name {job_name} has failed its execution."
• f"Unexpected error in the operation: Batch job with name {job_name} is being deleted."

Test: breeze run pytest providers/google/tests/unit/google/cloud/hooks/test_cloud_batch.py -xvs

---

Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)

---

• Read the Pull Request Guidelines for more information. Note: commit author/co-author name and email in commits become permanently public when merged.
• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
• When adding dependency, check compliance with the ASF 3rd Party License Policy.
• For significant user-facing changes create newsfragment: {pr_number}.significant.rst, in airflow-core/newsfragments. You can add this file in a follow-up commit after the PR is created so you know the PR number.