Adding missing file ncdap_test/manyurls.h

[DennisHeimbigner]

re: Github Issue: #2085

The file ncdap_test/manyurls.h was not added to the repository.
It is controlled by the --enable-dap-long-tests option.
Solution: add the file.

[dopplershift]

Is nothing building in CI that should have caught that?

[DennisHeimbigner]

This is controlled by --enable-dap-long-tests, which is one of a number of
options unlikely to be used, and so not tested routinely. There are a number of others,
Perhaps we should have a non-matrix'ized github action that is specifically to test
some of these outlier options.

[DennisHeimbigner]

BTW, the reason we don't add a row to the matrix for these is that the size of the matrix
is limited and we would soon exceed the allowed size for matrices.

[WardF]

I've merged this in to #2093 and am expanding the github actions to make sure that adding the missing file doesn't result in new/different failures.

[WardF]

@DennisHeimbigner I'm seeing failures when enabling enable-dap-long-tests. I'll start debugging these, but you can see the details over at #2093