Removed unnecessary `console.log` statements from `pdf-viewer.js`
and `receiver-signature.js` to reduce console output in production.
Simplified error handling in `pdf-viewer.js` for better clarity,
including consolidating error logging and removing redundant
handling for `RenderingCancelledException`.
Deleted the `debugDumpViewerDom` function and its public API
reference from `receiver-signature.js` as part of a cleanup
effort to eliminate unused debugging utilities. Streamlined
code related to event listener management in `pdf-viewer.js`
while retaining core functionality.
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