Backport of cli: Fix plan diff for sensitive nested attributes into v1.1

[teamterraform]

Backport

This PR is auto-generated from #30825 to be assessed for backporting due to the inclusion of the label 1.1-backport.

The below text is copied from the body of the original PR.

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When rendering diffs for resources which use nested attribute types, we must cope with collections backing those attributes which are entirely sensitive. The most common way this will be seen is through sensitive values being present in sets, which will result in the entire set being marked sensitive.

This approach fixes the crash by entirely omitting sensitive collections from the diff output. For some situations this is reasonable—for example, a list(string) which is populated by a sensitive variable should be elided from user view. In other use cases, notably set-backed nested attributes, this is likely to be counter-intuitive. Unfortunately, given how cty copes with marks on sets, I don't see any alternative at this time.

Fixes #30824.

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