Fix MFEM Continuous LOR Vector Magnitude Projection Bug

[JustinPrivitera]

Description

Resolves #20983

Changes are WIP thus far, but initial results are good and all the other tests pass. I just need to clean up several things.

Type of change

• Bug fix~~
• New feature~~
• Documentation update~~
• Other~~

How Has This Been Tested?

Reminders:

• Please follow the style guidelines of this project.
• Please perform a self-review of your code before submitting a PR and asking others to review it.
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Checklist:

• I have commented my code where applicable.~~
• I have updated the release notes.~~
• I have made corresponding changes to the documentation.~~
• I have added debugging support to my changes.~~
• I have added tests that prove my fix is effective or that my feature works.~~
• I have confirmed new and existing unit tests pass locally with my changes.~~
• I have added new baselines for any new tests to the repo.~~
• I have NOT made any changes to protocol or public interfaces in an RC branch.~~

[JustinPrivitera]

codex resume 01a0258d-9c74-7710-86a6-74d6091214dc