Reinstall #5382 (deterministic-diamondC_1x1x1_pp-multi_dmc_sdj-1-1-2-mpc related fixes)

[prckent]

Proposed changes

Address occasional statistical failures, e.g. https://cdash.qmcpack.org/testSummary.php?project=1&name=deterministic-diamondC_1x1x1_pp-multi_dmc_sdj-1-1-2-mpc&date=2025-04-04

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

• Testing changes (e.g. new unit/integration/performance tests)

Does this introduce a breaking change?

• No

What systems has this change been tested on?

None

Checklist

Update the following with a yes where the items apply. 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.

• Yes. This PR is up to date with current the current state of 'develop'
• No. Code added or changed in the PR has been clang-formatted
• No. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• No. Documentation has been added (if appropriate)

[ye-luo]

#5389 reverted my fix #5382 to #5377. all the tests were fine before the Thursday regression. Need to address the regression.

[ye-luo]

Test this please