make sku_name suppress case difference - azurerm_key_vault

[njuCZ]

fix #8457

now, the portal's default behaviour for "sku" is "Standard". after terraform import there will be diff because only "standard" and "premium" is accepted.

[njuCZ]

@katbyte I have added a link to the rest-api-specs issue, could you please have a look again?

[njuCZ]

it seems there is some problem with the CI, I will close and reopen it

[katbyte]

thanks, Instead of just making it fully case insensitive could we just allow standard and premium in addition to the camel cased ones?

[njuCZ]

@katbyte according to service team's reply Azure/azure-rest-api-specs#10943 (comment) sku_name is not case-sensitive, I am afraid that the portal will change again. I think it's better to make it fully case insensitive

[tombuildsstuff]

Closing this in favour of #8983 which instead rewrites the casing to ensure it's consistent with what the SDK defines, meaning the configuration is the source of truth here.

[ghost]

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