backend/oss: Supports more standard environment variables to keep same with provider setting

[xiaozhu36]

Currently, Alibaba Cloud has standardized and normalized the environmental variable requirements for authentication parameters such as AccessKey, SecretKey, etc., on the tool side. Based on this requirement, all tools need to support these standardized environment variables. The terraform-provider-alicloud has already completed the necessary adjustments, and the oss backend also needs to support these standardized environment variables to ensure a consistent user experience.

Target Release

1.12.x

CHANGELOG entry

ENHANCEMENTS
backend/oss: Adds new arguement tablestore_instance_name used to VPC scenario

[SarahFrench]

Thank you for your contribution!

These additional environment variables and other code changes make sense to me, and the PR doesn't introduce breaking changes by removing the older ENVs. Also, I'm approving under the assumption that you have done the necessary testing of the changes, as the backend's maintainer.

This will be included in the v1.12 release.

[github-actions]

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