Migrate Office 365 Custom Provisioning example from Rule to Action

[patkub]

Description

The example Office 365 Custom Provisioning Rule should be rewritten as a post-login Action.

https://github.com/auth0/docs-v2/blob/b18ee7e1002fc6341a5a0f339639a64a8af47047/main/docs/customize/integrations/office-365-custom-provisioning.mdx#create-the-azure-ad-provisioning-rule

Notes

• My previous issue got closed automatically by PR merge for the ws-fed rule.
• I don't have a setup able to test the Azure AD provisioning rule/action.

[hazel-nut]

oops, sorry for the auto-closure on the other issue!