Add ability to create and update Sensitivity label publishing policies

[system-15]

Please confirm:

• I have searched existing feature requests (open and closed) and found no duplicates.
• **Me or my organization currently has an active subscription to the product at the €99/month level.

Problem Statement

We can push the labels but cannot do anything with them as not publishable in CIPP :(

Benefits for MSPs

We are standardising labels for AI etc and think it would be great to push the labels and policy from CIPP

Value or Importance

Nice to have really

PowerShell Commands (Optional)

No response