[BREAKING] Clean up tests

[gdalle]

Warning

Breaking changes: entire revamp of Scenario and other DIT functions.

DIT source

• Change the type parameters and constructors of Scenario to accurately reflect the new terminology. We now have two distinctions:
  • in-place/out-of-place operators
  • in-place/out-of-place functions (no longer called 1-arg/2-arg functions due to the arrival of context arguments)
• Rename the seed field of Scenario into tang to reflect the new Tangents typing
• Let the Scenario constructor decide between y = f(x) and f!(y, x), based on whether y is passed or not
• Remove specific constructors for each operator: GradientScenario becomes Scenario{:gradient}
• Refactor and document scenario modificators.
• Change the default_scenarios function to allow inclusion of batchified, closurified or constantified scenarios with just a kwarg (not public API yet). Here's the logic:
  1. First, batchified scenarios are added or not
  2. Then, batchified and standard scenarios together are closurified or constantified.
• Remove filtering options in test_differentiation and benchmark_differentiation
• Centralize and rename utility functions

DIT tests

• Add some tests for scenarios whose correctness remained untested.

DI source

• Fix sparse AD with contexts by putting them into a closure for sparsity pattern detection.

DI tests

• Spread the load by splitting internals into several workflows

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.96552% with 3 lines in your changes missing coverage. Please review.

Project coverage is 98.50%. Comparing base (d51fc0a) to head (c4ac250).

Files with missing lines	Patch %	Lines
DifferentiationInterfaceTest/src/utils.jl	86.36%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #470      +/-   ##
==========================================
- Coverage   98.51%   98.50%   -0.01%     
==========================================
  Files         108      107       -1     
  Lines        4297     4291       -6     
==========================================
- Hits         4233     4227       -6     
  Misses         64       64              

Flag	Coverage Δ
DI	98.57% <100.00%> (+<0.01%)	⬆️
DIT	98.37% <98.92%> (-0.02%)	⬇️

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