Store tests by relative instead of absolute paths in the previous results file

[loganharbour]

Closes #28988

[moosebuild]

Job Documentation, step Docs: sync website on 6d407e2 wanted to post the following:

View the site here

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[moosebuild]

Job Coverage, step Generate coverage on 6d407e2 wanted to post the following:

Framework coverage

	c80f51	#28989 6d407e
	Total	Total	+/-	New
Rate	85.08%	85.08%	+0.00%	-
Hits	106568	106569	+1	0
Misses	18695	18694	-1	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
• thermal_hydraulics
• xfem

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[loganharbour]

This is ready. It makes it easier to copy content from HPC test results into an external directory (for the bison assessment, for example).

It also removes the ability to provide multiple spec files for a single run, which was inconsistently supported and not used in practice.

[milljm]

I think you need to update the TestHarness hash. Unless we're ignoring this for the time being.

[loganharbour]

I think you need to update the TestHarness hash. Unless we're ignoring this for the time being.

It's already updated, hence why https://civet.inl.gov/job/2526480/ ran