[IMP] web_editor: prevent removing data-oe attrs of snippets thumbs

Before this commit, all the data-oe-* attributes were removed from
the snippet panel on editor loading. Some were actually added then
removed by the same function... probably for historic reasons. All of
this is now useless, this commit takes also the opportunity to modernize
that all code section and removes other code which was there for
compatibility reasons too.

Now, the data-oe-* on snippets thumbs are kept (as some will actually
be used by upcoming commits). This commit just makes sure no data-oe-*
is left on the snippet bodies themselves.

Part of https://github.com/odoo/odoo/pull/55272
task-2309832

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