REFACTOR-#6939: Make 'modin.pandas.DataFrame._to_pandas' a public method #381

Job	Run time
lint (flake8)	12s
lint (mypy)	2m 27s
lint (black and isort)	16s
execution-filter	10s
Test API, headers and no-engine mode	2m 8s
test-internals	0s
Test ${{ matrix.execution }} execution, Python 3.9	0s
test-asv-benchmarks	0s
test-clean-install-${{ matrix.os }}	0s
Test HDK storage format, Python 3.9	0s
test experimental	0s
test-spreadsheet (engine ${{ matrix.engine }}, python ${{ matrix.python-version }})	0s
test-${{ matrix.os }} (engine ${{ matrix.engine }}, python ${{ matrix.python-version }}, ${{ matrix.test_task }})	0s
test-${{ matrix.os }}-sanity (engine ${{ matrix.execution.name }}, python ${{ matrix.python-version }})	0s
test-ubuntu (engine unidist ${{ matrix.unidist-backend }}, python ${{ matrix.python-version }})	0s
upload-coverage	6s
	5m 19s

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