[MAINT]: Remove read call from create/update #2892

Describe the need

This provider make heavy use of calling the read function instead of duplicating logic in the create/update functions; while this may look clean and DRY it has a significant impact. Firstly it means that changes generally use twice as many API calls to make as they should (or more in cases where a single resource is mapped to multiple API calls); which is impactful given the low API rate limits imposed by GitHub. Secondly it means that systems which don't have strict read after write guarantees may be returning incorrect values to be stored in the state.

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API Version

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