Avoid delegating to module.useNode() for .js and .mjs modules.
Avoid delegating to module.useNode() for .js and .mjs modules.

This partially reverts f0d39b86e61390677254834730dc08390620dfd1 by simply
including .js and .mjs modules in the server bundle, rather than
delegating to pure Node evaluation. In practice, whether or not the
package has a "module" entry point (or "type":"module") in its
package.json was not a perfect indicator of whether it should be compiled
with Reify and bundled, or left untouched and handled by Node.

Truly native modules (such as those with a .node file extension) should
always be handled by Node, so module.useNode() definitely still has a role
to play in the server bundle.

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