Speed up serialize and deserialize, don't load tests on init

[loganharbour]

Closes #31831

This is in support of performance improvements for the web application that will parse these databases.

• Changes all arguments for getting a test to a TestName instead of two strings (folder and test name)
• Add query_test for getting a test if it is available, otherwise None
• Do not construct each individual test within a single result on init (speeds up initial construction)
• Optimize serialize and deserialize methods
• Don't connect to the client/database unless needed

[moosebuild]

Job Documentation, step Docs: sync website on 8fd75ad wanted to post the following:

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Job Coverage, step Generate coverage on 8fd75ad wanted to post the following:

Framework coverage

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Modules coverage

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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

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Job Test, step Results summary on 8fd75ad wanted to post the following:

Framework test summary

Compared against b79a48d in job civet.inl.gov/job/3380566.

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Modules test summary

Compared against b79a48d in job civet.inl.gov/job/3380566.

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