allow to configure sharepoint access token

[christian-sahlmann]

Description

This allow to use an access token directly instead of requiring to create client credentials via the azure portal.

Such an access token can be obtained without any special permissions by opening the desired sharepoint site and extracting the token with the browser developer tools from the request to the /token endpoint.

Such an access token is typically only valid for 1h, but this is enough for a one-time import.

How Has This Been Tested?

Successfully imported our Sharepoint Site into our local Onyx instance.

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[vercel]

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