Update Validate-Formatting to use black output vs git diff

[Scott Beddall (scbedd)]

Here is a failing build. the reason this is happening is because the script currently will break on anything being different at all. Unfortunately the template pipeline actually modifies the version and the changelog, so this means that the validate formatting finds a git diff and explodes.

Do you have any issues with this Sean Kane (@seankane-msft) ?

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[Sean Kane (seankane-msft)]

LGTM

[Daniel Jurek (danieljurek)]

/azp run python - template

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Scott Beddall (scbedd)]

/check-enforcer override