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GH-44303: [C++][FS][Azure] Fix minor hierarchical namespace bugs (#44307)



### Rationale for this change
There are a couple of minor bugs in the `AzureFileSystem` for hierarchical namespaces accounts. These cause failures in `TestAzureHierarchicalNSGeneric.GetFileInfoSelectorWithRecursion` and `TestAzureHierarchicalNSGeneric.Empty` which do not run automatically in CI.

### What changes are included in this PR?
- Fix incorrectly returning Not found on recursive get file info on container root. 
- Implement `selector.max_recursion` for hierarchical namespace. This is implemented completely artificially after `directory_client.ListPaths(/*recursive=*/true)`.
- Enable a couple of features on the generic tests that were disabled but are actually supported. 

### Are these changes tested?
There already failing tests for these but they don't run on CI because they require connect to a real Azure blob storage account. I made sure to run all the tests locally including the ones that connect to real Azure storage, both flat and hierarchical and all the tests passed. 

### Are there any user-facing changes?

* GitHub Issue: #44303

Lead-authored-by: Thomas Newton <thomas.w.newton@gmail.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>