Update WebApps AppServicePlans: Fix delete response code, add ScmType…

[nking-1]

… enum, add linuxFxVersion property

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[dsgouda]

LGTM

[nking-1]

We noticed there are a couple of other files that need updating. Added them to this PR. The changes are basically the same across all files.

[AutorestCI]

No modification for Ruby

[AutorestCI]

No modification for Python

[AutorestCI]

No modification for NodeJS