Adding interop tests

Fedora has some fairly nice interoperability tests that we can leverage
to build a PR and test it against gnutls and nss libraries.  This commit
adds the interop-tests.yml ci job to do that work, and run the interop
tests from beaker.

Fixes #20685

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from #22726)

(cherry picked from commit 83783dd)

.github/workflows/interop-tests.yml

@@ -1,8 +1,3 @@
-# Notes:
-# /__w/openssl is the path that github bind-mounts into the container so the ci
-# filesystem for this job can be reached.  Please note that any changes made to
-# this job involving file system paths should be made prefixed with, or relative
-# to that directory
 name: Interoperability tests with GnuTLS and NSS
 on:
   schedule: