Required properties on insert and update should be specified in `requiredProperties`

Workload owners should explicitly specify required properties on insert and update in requiredProperties as stated at https://github.com/oasis-tcs/odata-vocabularies/blob/814f2fdc1828d321a707de4c2da8cc7f128a0a29/vocabularies/Org.OData.Capabilities.V1.md#insertrestrictionstype.

• InsertRestrictions

• UpdateRestrictions

Also, navigation properties that don't support deep inserts and rebinding should be specified in NonInsertableNavigationProperties and NonUpdatableNavigationProperties respectively.

This is needed to ensure SDKs surface updatable and insertable properties accurately. The CSDL is the sole source of truth for SDKs and other tools. The accuracy and completeness of the CSDL is critical in generating self-documenting SDKs.

Start by comparing the Microsoft Graph CSDL metadata with the linked OData Capabilities definitions for InsertRestrictionsType and UpdateRestrictionsType. Check how requiredProperties and non-insertable or non-updatable navigation properties are represented. Done means the CSDL accurately exposes these constraints so SDKs and other tools can generate correct property behavior.