bug#46351: 28.0.50; Add convenient way to bypass Eshell's own pipelining

[Lars Ingebrigtsen]

Sean Whitton <spwhitton@spwhitton.name> writes:

> I put the "... ends here" fix into 667e212048 rather than 1693423fd7
> which is not now fixable.  However, I also noticed that
> em-extpipe-tests.el lacks a `provide' form so here is a fix for that.
> Pretty sure that's it for now.  Thank you for reviewing and applying!

We don't usually add provides in the test files, so that doesn't seem
necessary.  

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