Add DELETE API to Microsoft.Security applicationWhitelistings

[erelh]

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[erelh]

@tjprescott who can review this please? thanks

[erelh]

@hyonholee @jaredmoo @yangyuan @naveedaz @schaabs @wilcobmsft who is the review owner of this PR ? can you please review ? thanks

[tjprescott]

I can do the review, but 112 files changed, where clearly most of it is formatting, is not practical. Please structure your commits so that the relevant changes are in one commit and pure formatting changes are in another.

[erelh]

@tjprescott copied to #8368 please take a look