ignore case change for aks private_dns_zone_id

[ms-henglu]

To address issue: #12784

[tombuildsstuff]

hi @ms-henglu

Thanks for this PR.

Unfortunately since this field contains both the Resource ID and the constant, this'll need to be normalised within the Read function rather than diff suppressed here.

Thanks!

[tombuildsstuff]

this can be a ResourceID too, as such this only wants to be applicable for System and None - instead this'll want normalizing in the Read function

[ms-henglu]

@tombuildsstuff , Hi, thanks for code review. I've updated the commits according to your suggestions, please take another look, thanks!

[katbyte]

Thanks @ms-henglu - LGTM 🩹

[github-actions]

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[github-actions]

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