azure-batch needs linting updates for pylint version 4.0.6

**ACTION NEEDED:** This version of pylint will be merged on **2026-10-12**. The build will begin to fail for this library if errors are not fixed.

**Library name:** azure-batch
**Pylint version:** 4.0.6
**Pylint Build:** [Link to build (2026-07-26)](https://dev.azure.com/azure-sdk/internal/_build/results?buildId=6617627&view=logs&j=e5b925a9-9650-5321-24fd-5d9499fe02b8&t=b33d1587-3539-5735-af43-e3e62f02ca4b)
**How to fix:** Run the `next-pylint` azpysdk command at the library package-level and resolve the linting errors.
1) `/mnt/vss/_work/1/s>pip install -e ./eng/tools/azure-sdk-tools`
2) `../azure-batch>azpysdk next-pylint --isolate .`

See the [Pylint Guide](https://github.com/Azure/azure-sdk-for-python/blob/main/doc/dev/pylint_checking.md) for more information.