Add dg kernels

[sean-baccas]

Closes #32268

[moosebuild]

Job Documentation, step Docs: sync website on db484ae wanted to post the following:

View the site here

This comment will be updated on new commits.

[moosebuild]

Job Coverage, step Generate coverage on db484ae wanted to post the following:

Framework coverage

	f85537	#32267 db484a
	Total	Total	+/-	New
Rate	85.85%	85.86%	+0.01%	100.00%
Hits	127686	127852	+166	180
Misses	21037	21050	+13	0

Diff coverage report

Full coverage report

Modules coverage

Coverage did not change

Full coverage reports

Reports

• framework
• chemical_reactions
• combined
• contact
• electromagnetics
• external_petsc_solver
• fluid_properties
• fsi
• functional_expansion_tools
• geochemistry
• heat_transfer
• level_set
• misc
• navier_stokes
• optimization
• peridynamics
• phase_field
• porous_flow
• ray_tracing
• rdg
• reactor
• richards
• scalar_transport
• solid_mechanics
• solid_properties
• stochastic_tools
• subchannel
• thermal_hydraulics
• xfem

This comment will be updated on new commits.

[moosebuild]

Job Precheck, step Clang format on 29f1f22 wanted to post the following:

Your code requires style changes.

A patch was auto generated and copied here
You can directly apply the patch by running, in the top level of your repository:

curl -s https://mooseframework.inl.gov/docs/PRs/32267/clang_format/style.patch | git apply -v

Alternatively, with your repository up to date and in the top level of your repository:

git clang-format f8553777c892c077a5a6faaeb1b6a7fda260344c

[moosebuild]

Job Test, step Results summary on db484ae wanted to post the following:

Framework test summary

Compared against f855377 in job civet.inl.gov/job/3535487.

Added tests

Test	Time (s)	Memory (MB)
mfem/kernels.MFEMDiffusionDG	0.67	0.00

Modules test summary

Compared against f855377 in job civet.inl.gov/job/3535487.

No change