Added IdentityFederation property to Workspace

[abij]

What changes are proposed in this pull request?

What: extra optional field on Workspace identity_federation_info

Why: I want to check if the Workspace is/was already connected to Unity, account-level. If workspace Identity federation is enabled I can fetch the permissions for example.

import os
from databricks.sdk import AccountClient

# Assume I have authenticated and stored as profile "ACCOUNT"
os.environ["DATABRICKS_CONFIG_PROFILE"] = "ACCOUNT"

a = AccountClient()
w = a.workspaces.get("387127*******")

if w.identity_federation_info:
    print(f"Identity Federation: {w.identity_federation_info.enable_identity_federation}")
else:
    print("Workspace does not have Identity Federation enabled.")

# Output: Workspace Identity Federation: True

How is this tested?

• I have based the code on the Website API response (Browser -> Networking-tab) in Account console.
• I've created a notebook to manually fetch a enabled and disabled IdentityFederated workspace. (code is attached)

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answering "Not tested" if the PR has not been tested. Being clear about what
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Inputs:

• PR number: 835
• Commit SHA: 720f7259e56f00ebdf3de6876044429f626c9606

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