Remove the unused jax enable_x64.

[james77777778]

Following #21604 and #21734, we no longer need enable_x64 in our tests since all 64bit tests were removed by default.

This PR further cleans up the test suit.

[gemini-code-assist]

Summary of Changes

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This pull request focuses on streamlining the test suite by eliminating the explicit disabling of JAX's 64-bit mode. Following previous updates that removed 64-bit tests by default, the enable_x64 context manager and related conditional dtype handling logic became redundant. The changes simplify the codebase, making tests cleaner and more maintainable without altering their intended behavior.

Highlights

• Removal of jax.enable_x64: The explicit usage of jax.enable_x64(False) and its associated context manager jax_disable_x64_context has been removed from various test files. This is a follow-up to previous changes where 64-bit tests were no longer enabled by default.
• Test Suite Cleanup: The pull request cleans up the test suite by removing unnecessary conditional logic and imports related to disabling JAX's 64-bit mode, simplifying the test code for truediv, add, subtract, multiply, array, divide, floor_divide, maximum, minimum, power, trace, true_divide, and where operations.
• Simplified Dtype Handling: Conditional logic that downcasted expected dtypes from 64-bit to 32-bit specifically for the JAX backend has been removed, as it is no longer required due to the default 32-bit behavior.

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[gemini-code-assist]

Code Review

This pull request removes the usage of jax.enable_x64 from the test suite, which is no longer necessary since 64-bit tests have been removed by default. The changes effectively clean up and simplify the tests in keras/src/backend/common/variables_test.py and keras/src/ops/numpy_test.py by removing now-redundant logic for handling 64-bit data types. Additionally, many assertions have been refactored to use the cleaner self.assertDType method, which improves test readability. The changes are correct and well-implemented.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.59%. Comparing base (3137cb0) to head (21ad9ce).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21737   +/-   ##
=======================================
  Coverage   82.59%   82.59%           
=======================================
  Files         572      572           
  Lines       58535    58535           
  Branches     9158     9158           
=======================================
  Hits        48345    48345           
  Misses       7853     7853           
  Partials     2337     2337           

Flag	Coverage Δ
keras	82.39% <ø> (ø)
keras-jax	63.19% <ø> (ø)
keras-numpy	57.56% <ø> (ø)
keras-openvino	34.33% <ø> (ø)
keras-tensorflow	63.94% <ø> (ø)
keras-torch	63.49% <ø> (ø)

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