provider/aws: homedir expand in s3 object source

[phinze]

fixes #3856

[jen20]

LGTM, though is this in conflict with our aim of getting rid of file references in favour of file interpolations?

[phinze]

@jen20 this resource already supports both styles, and I realized that this resource could be used to upload large and/or binary files, in which case you probably don't want them to be pulled in through an interpolation, so I figured better to just leave this one be.

The motivation is primarily around enabling users to lift sensitive material off disk, and that's already possible here. 👍

[ghost]

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