Debug Flux tests

[gdalle]

DIT and DI tests

• Set the tolerance levels for Flux tests to the same values as in the Enzyme test file
• Add random seeding to ensure reproducible results (but not across julia versions)

See also:

• DifferentiationInterface testing FluxML/Flux.jl#2469 (comment)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.57%. Comparing base (a78c820) to head (d6e1955).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #371   +/-   ##
=======================================
  Coverage   96.57%   96.57%           
=======================================
  Files          99       99           
  Lines        4876     4876           
=======================================
  Hits         4709     4709           
  Misses        167      167           

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