Improve error messages regarding EOS tokens requested for inaccessible EOS locations
e.g. https://gitlab.cern.ch/lhcb-charm/charm-production-run-3/-/jobs/32601553
When a token is requested for a path that is not configured as an accessible location, the error is not descriptive enough for the end-user.
In an ideal world we explain that while the user [that triggered the CI job] has configured the repository correctly, an EOS path was requested that was not explicitly permitted (e.g. path that is read-only but a writable eos token was requested). Then either provide a link to the user to add that path or explain clearly what is happening and link to https://lhcb-analysis-productions.web.cern.ch/settings/.