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WIP #75 Create diagnostic for COPY's --from=stage flag

COPY supports a --from=stage flag for specifying the build stage to
copy content from. If the flag is incorrectly named, we should warn
the user of this fact. If the flag is not written all in lowercase,
an error will be generated as flags are case-sensitive in
Dockerfiles.

Signed-off-by: Remy Suen <remy.suen@gmail.com>

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