When rendering a stored plan file as JSON, we include a data structure
representing the sensitivity of the changed resource values. Prior to
this commit, this was a direct representation of the sensitivity marks
applied to values via mechanisms such as sensitive variables, sensitive
outputs, and the `sensitive` function.
This commit extends this to include sensitivity based on the provider
schema. This is in line with the UI rendering of the plan, which
considers these two different types of sensitivity to be equivalent.
Co-authored-by: Kristin Laemmert <mildwonkey@users.noreply.github.com>
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