fix(replay): Add MIME type to worker blob URL for Safari compatibility

[sentry]

Safari and iOS WebKit environments enforce stricter MIME type validation for Web Workers loaded from blob: URLs. Previously, the Replay compression worker's blob URL was created without an explicit MIME type, causing it to default to text/plain.

This led to Safari silently rejecting the worker script, resulting in the "Failed to load Replay compression worker: Unknown error" message, as the worker's error event would fire without a descriptive ErrorEvent.message.

This change explicitly sets the MIME type to text/javascript when creating the worker blob, ensuring Safari correctly interprets and loads the worker script, thus resolving the issue.

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Closes #issue_link_here

Fixes JAVASCRIPT-37KM

_{Comment @sentry <feedback> on this PR to have Autofix iterate on the changes.}

[billyvg]

dupe of #22377