tests: Improve _bool_array_to_int in DI reader test

[bkeryan]

• [x] This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

• Use NumPy slicing instead of reversed(...) to reverse the bool array.
• Use int(bit) to explicitly convert the NumPy array element to a Python int, which prevents setting the sign bit with large ports and returning negative numbers.
• In one test case, slice a 2D bool array into a 1D bool array view in order to avoid DeprecationWarning: Conversion of an array with ndim > 0 to a scalar is deprecated, and will error in future. Ensure you extract a single element from your array before performing this operation. (Deprecated NumPy 1.25.)

Why should this Pull Request be merged?

Fix issues I discovered when writing another test.

What testing has been done?

poetry run pytest -v .\tests\component\test_stream_readers_di.py passes with LibraryInterpreter. (I don't currently have NI gRPC Device Server installed.)

[github-actions[bot]]

Test Results

    34 files  ±0      34 suites  ±0   47m 42s :stopwatch: + 2m 0s  2 248 tests ±0   1 910 :white_check_mark: ±0    338 :zzz: ±0  0 :x: ±0  39 690 runs  ±0  34 134 :white_check_mark: ±0  5 556 :zzz: ±0  0 :x: ±0 

Results for commit 07671a88. ± Comparison against base commit 5e0380b7.