[WIP] Increase-test-coverage for keras_tensor and variables+ Fix __invert__ + Fix FloorDivide

[Faisal-Alsrheed]

Increase-test-coverage for keras_tensor + Fix __invert__ method and update FloorDiv references in keras_tensor.py

1. Fixes a TypeError encountered when using the unary bitwise inversion (~) on a KerasTensor object. The __invert__ method had an incorrect signature, accepting an unnecessary other parameter.
2. Updates references from FloorDiv to FloorDivide to align with the correct operation name.

Changes:

1. Modified the __invert__ method in keras_tensor.py to remove the other parameter and correctly call the LogicalNot operation:

2. Updated all occurrences of FloorDiv to FloorDivide in keras_tensor.py to ensure correct behavior.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -16.57% ⚠️

Comparison is base (9bf92c8) 83.83% compared to head (e2ab5dc) 67.26%.
Report is 6 commits behind head on main.

❗ Current head e2ab5dc differs from pull request most recent head 6513f13. Consider uploading reports for the commit 6513f13 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #944       +/-   ##
===========================================
- Coverage   83.83%   67.26%   -16.57%     
===========================================
  Files         319      319               
  Lines       28879    28879               
  Branches     5529     5529               
===========================================
- Hits        24211    19426     -4785     
- Misses       3148     8117     +4969     
+ Partials     1520     1336      -184     

Flag	Coverage Δ
keras_core	67.26% <100.00%> (-16.47%)	⬇️
keras_core-jax	?
keras_core-numpy	?
keras_core-tensorflow	67.26% <100.00%> (+0.18%)	⬆️
keras_core-torch	?

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Files Changed	Coverage Δ
keras_core/backend/common/keras_tensor.py	99.29% <100.00%> (+29.07%)	⬆️

... and 89 files with indirect coverage changes

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[fchollet]

Keras Core is becoming Keras 3, and we're switching development to the main repository! Please reopen this PR in the keras-team/keras repository. Unfortunately we aren't able to automatically transfer PRs (but we have transferred all issues).