CLI fixes for hotpatching the playground #4715
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Ran into a few issues with the new hot patching tool command when trying to implement hot patching for the playground. This PR fixes those issues
First the command accepts the json metadata as a CLI argument which fails because the input is to large. To fix that issue, this PR changes the command to read the input from stdin
Second the patch returned by the command is formatted as a local file instead of a url even when targeting web. There was some existing logic to handle reformatting the paths for serve but they didn't handle the base paths correctly