[site config] aws-ec2 ubuntu config updates for 2.1 release

[eap]

Site config updates for the current JCSDA maintained ec2 AMIs

Note: Because my toolchain changes would also break other site configs in this release, I have removed toolchains from this PR.

Testing

Locally tested

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.
• All necessary updates to the documentation (spack-stack wiki) will be made when this PR is merged --- TODO (will resolve before submitting this PR)

[eap]

Future changes to this file will be easier to parse as I'm now maintaining them in alphabetical order (if you squint)

[climbfuji]

I am very surprised that this still works. I couldn't get anything to concretize without duplicates or errors if I had a non-buildable runtime library for any of the compilers.

[eap]

interesting indeed! This is definitely working in my case. Although I did experience that issue with gcc runtime.

$ cat log.concretize  | grep runtime
 -   x4mnxf4          ^gcc-runtime@13.3.0 build_system=generic platform=linux os=ubuntu24.04 target=icelake
[e]  uc6376q      ^intel-oneapi-runtime@2025.3.0 build_system=generic platform=linux os=ubuntu24.04 target=x86_64

[climbfuji]

I know you were using toolchains originally, and maybe that's why you didn't need

spack-stack/configs/sites/tier1/atlantis/packages_oneapi-2025.3.0.yaml

Lines 2 to 7 in a4527ef

	all:
	require:
	- any_of: ['%intel-oneapi-compilers@=2025.3.0']
	when: '%intel-oneapi-compilers'
	- any_of: ['%gcc@=11.2.0']
	when: '%gcc'

or the equivalent for gcc?

[eap]

Unfortunately yes. This PR is kind of a mix. The real site config uses toolchains but that included a number of changes (including changes to the configs/common/...) that would have broken other sites if they were submitted.

So this PR is me doing my best to submit the ec2 config changes without breaking every other site simultaneously.

[eap]

this snuck into the docs in 2.0 even though it wasn't used.

[climbfuji]

Please merge when you are ready