Minor: Add helpful names for parameterized tests in `dataframe.schemas_test`

[TheNeuralBit]

GitHub Actions Tests Status (on master branch)

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[codecov[bot]]

Codecov Report

Merging #22630 (105b00e) into master (cc0b446) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #22630      +/-   ##
==========================================
- Coverage   74.20%   74.19%   -0.02%     
==========================================
  Files         708      708              
  Lines       93462    93462              
==========================================
- Hits        69354    69342      -12     
- Misses      22833    22845      +12     
  Partials     1275     1275              

Flag	Coverage Δ
python	83.59% <ø> (-0.02%)	:arrow_down:

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Impacted Files	Coverage Δ
.../python/apache_beam/testing/test_stream_service.py	88.09% <0.00%> (-4.77%)	:arrow_down:
.../apache_beam/runners/interactive/dataproc/types.py	93.10% <0.00%> (-3.45%)	:arrow_down:
...python/apache_beam/runners/worker/worker_status.py	78.26% <0.00%> (-1.45%)	:arrow_down:
sdks/python/apache_beam/io/source_test_utils.py	88.01% <0.00%> (-1.39%)	:arrow_down:
...che_beam/runners/interactive/interactive_runner.py	90.06% <0.00%> (-1.33%)	:arrow_down:
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	:arrow_down:
...hon/apache_beam/runners/worker/bundle_processor.py	93.67% <0.00%> (ø)
...eam/runners/interactive/interactive_environment.py	92.02% <0.00%> (+0.30%)	:arrow_up:
sdks/python/apache_beam/utils/interactive_utils.py	97.56% <0.00%> (+2.43%)	:arrow_up:

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[TheNeuralBit]

@y1chi do you have time to review this? It's pretty small :)