function: Update documentation for terraform-plugin-testing v1.7.0 features

[bflad]

Module version

v1.6.0

Use-cases

The upcoming terraform-plugin-testing v1.7.0 will include enhancements that will be directly helpful for provider-defined function testing, including:

• Readily available tfversion.Version1_8_0 variable for implementing tfversion.SkipBelow()
• Additional plan checking capabilities
• New state checking capabilities (e.g. replacing resource.TestCheckOutput()), which we would prefer to show over the older style state checks

Proposal

When terraform-plugin-testing v1.7.0 is released, updating the website documentation for provider-defined function testing. This can be found in website/docs/plugin/framework/functions/testing.mdx.

[github-actions]

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