[FIX] web_editor: optimize big mail transcoding

The browser may throw an error when a big mail such as one with
hundreds thousands of tags is being transformed to have a style
more compatible with mail clients.

The error would be:
 "Uncaught RangeError: Maximum call stack size exceeded"

This happens in jquery because we hare too many nodes (there is an
ongoing issue at https://github.com./jquery/sizzle/issues/403) so this
commit replace that part by a DFS traversal over DOM nodes.

There was also an issue that not having the option "style-inline" would
still cause some style code to be ran albeit it was intended not to be
solved in 55c7d2d5b00.

opw-1841107
closes #24550

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