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This is the same PR as #36589 and #37909 both of which were previously signed off by ARM, but I need to rebase it from main again as the SDK has changed, which prevents SDK checks to fail. Also added the commit that fix the recent breaking changes from ARM SDK (see #38185). 4th attempt to fix the Typespec validation.

ARM (Control Plane) API Specification Update Pull Request

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I am not sure I understood the context of this PR.
Another #38185 doing the same changes is also in review. Why is this needed?
Please send in an empty commit, so that the automated checks will trigger.

@ramoka178 I have closed #38185 because I could not make a proper rebase on main for it. This PR is equivalent to that one with the proper rebase.