Required properties on StaticSites_CreateOrUpdateStaticSite are missing

According to Swagger, https://github.com/Azure/azure-rest-api-specs/blob/main/specification/web/resource-manager/Microsoft.Web/stable/2020-12-01/StaticSites.json#L200, only resource name, resource group name, subscription id, and location are mandatory for `StaticSites_CreateOrUpdateStaticSite`. But we found it requires more. The issue comes from https://github.com/Azure/azure-powershell/issues/16594

No required attribute is defined on `StaticSite` https://github.com/Azure/azure-rest-api-specs/blob/ea0f7b072ad3aaff203ea9003246b9e584b819ff/specification/web/resource-manager/Microsoft.Web/stable/2020-12-01/StaticSites.json#L2812.

Start with specification/web/resource-manager/Microsoft.Web/stable/2020-12-01/StaticSites.json, inspecting the StaticSites_CreateOrUpdateStaticSite operation near line 200 and the StaticSite definition near line 2812. Review the linked Azure PowerShell issue to determine which properties are actually required; the specification is complete when those requirements are represented consistently.

Written by the indexing model from the issue text.