Backport of command/format: Correctly quote diff object keys into v1.1 #30784
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Backport
This PR is auto-generated from #30766 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.
This is a port of #25443 to the new diff renderer.
Fixes #21749
When rendering a diff, we should quote object attribute names if the string representation is not a valid identifier. While this is not
strictly necessary, it makes the diff output more closely resemble the configuration language, which is less confusing.
This commit applies to both top-level schema attributes and any object value attributes. We use a simplistic
"%q"
Go format string to quote the strings, which is not strictly identical to HCL's quoting requirements,but is the pattern used elsewhere in HCL and Terraform.