Temporarily remove preconditioner

[quantumsteve]

Please review the developer documentation on the wiki of this project that contains help and requirements.

Proposed changes

Describe what this PR changes and why. If it closes an issue, link to it here with a supported keyword.

Temporarily disabling the preconditioner to rule out one possible reason for test failures with CUDA 12.4

What type(s) of changes does this code introduce?

Put an x in the boxes that apply.

• [ ] Bugfix
• [ ] New feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

Does this introduce a breaking change?

• [ ] Yes
• [ ] No

What systems has this change been tested on?

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. This is simply a reminder of what we are going to look for before merging your code.

• [ ] this PR is up to date with current the current state of 'develop'
• [ ] code added or changed in the PR has been clang-formatted
• [ ] this PR adds tests to cover any new code, or to catch a bug that is being fixed
• [ ] documentation has been added (if appropriate)

[quantumsteve]

@mkstoyanov The asgard-unit-cuda job is using a CUDA 12.4 container

[mkstoyanov]

You got it right, this replaces the preconditioner with identity. We are not merging this but it may help you isolate the CUDA issue.

[quantumsteve]

I marked this as draft so it's harder to accidentally merge.