test: make test-worker-esm-missing-main more robust

test-worker-esm-missing-main failed in CI recently in a way that
suggests that maybe the `does-not-exist.js` file did in fact exist.
Maybe that isn't what happened at all, but let's rule it out by changing
the use of `does-not-exist.js` from a file expected to be missing from
the current working directory to a file in the temp directory, which the
test will remove and recreate at the outset.

PR-URL: https://github.com/nodejs/node/pull/27340


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>