fix: ensure 'bucket_name' falls back to default if missing or falsy

[ANIR1604]

This PR ensures that :

1. Add fallback for bucket_name parameter when missing or empty.
2. Uses service_config to set default bucket_name if not provided in function arguments.

Closes: #43379
Assigned By: @potiuk

[potiuk]

Can you pleas add a unit test covering it ?

[ANIR1604]

Can you pleas add a unit test covering it ?

Should i create a new file including the unit test code or edit the existing test file?

[potiuk]

Can you pleas add a unit test covering it ?

Should i create a new file including the unit test code or edit the existing test file?

Depends what you find easier. Usually modifying/extending/adding files in existing test suite is easier and make more sense - but it's up to your judgment to propose it. How and where to add unit tests is part of the solution to an error.

[ANIR1604]

Can you pleas add a unit test covering it ?

I had added unit test covering my PR regarding S3 bucket_name.