Add host ursa to tier1 sites

[rickgrubin-noaa]

Summary

Add required config files new tier1 host ursa

Testing

Build / install unified-dev environment for oneAPI and GNU compilers.

Note that Intel compilers prior to v2024.2.1 are not specified / stack not built.

Systems affected

ursa (TDS host)

Issue(s) addressed

spack-stack-1.9.0 release tasks

Checklist

• This PR addresses one issue/problem/enhancement, or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.

[climbfuji]

Any updates needed for readthedocs (doc/source/PreconfiguredSites.rst)? I don' think there is any information on Ursa yet. There's a table and a section on what to do for building new spack-stack environments.

[rickgrubin-noaa]

Any updates needed for readthedocs (doc/source/PreconfiguredSites.rst)? I don' think there is any information on Ursa yet. There's a table and a section on what to do for building new spack-stack environments.

Undoubtedly will require new info.

Given that ursa is a TDS and will change, will almost certainly need to update later as well.