[core] stub url path is empty if query url

[l0lawrence]

If the stub_url is a starts with a query "?restype", stub_url_path is then empty and we do not need to append a "/" to the end of parsed_base_url

i.e. https://github.com/l0lawrence/azure-sdk-for-python/blob/9fe8f5081384380ba5f0cfa4803918f5bfcec6ae/sdk/storage/azure-storage-blob/azure/storage/blob/_generated/azure/storage/blobs/_operations/_operations.py#L58C1-L58C46

[pvaneck]

Change LGTM. Let's update the failing test, and also add an assertion where the stub_url is just a query string

[pvaneck]

I think we also need a changelog entry since this affects behavior of the public format_url method.

Something like:

• Fixed PipelineClient.format_url to avoid adding trailing slashes when the URL template contains only query parameters.

Also, looks like we have some recording mismatches in a few of the azure-data-tables tests.

request https://Sanitized.table.core.windows.net/mytable3f8138ee?restype=service&comp=properties
record  https://Sanitized.table.core.windows.net/mytable3f8138ee/?restype=service&comp=properties

@l0lawrence Did the storage recordings not have slashes before the query strings?