fix(gatsby-plugin-image): Fix image rendering issues #30097
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We were previously setting the sizer with dangerouslySetHTML before hydration, but this was causing rendering issues such as #29982, #30052 and #30024. This PR switches to rendering an empty layout wrapper as the placeholder instead. This is going to need some checking, as @laurieontech I know you did it like that for a reason!
This also no longer conditionally renders the placeholder, as this was causing a flicker, e.g. #29911. I can no longer reproduce the issue that was the reason I originally made this change, which was the blur-up happening even when an image was already loaded. If it returns, we should try fixing it with React.memo instead. Please let me know if you have a repro of that original issue.