NO-SNOW: Fix flaky regr_* doctests #20685

Job	Run time
Type Checking	51s
Check linting	2m 55s
Build Doc	2m 6s
Build Wheel File	18s
Test AST enabled (phase0) py-ubuntu-latest-3.13	38m 38s
Test AST Encoding py-ubuntu-latest-3.11-aws	2m 26s
Test modin extra without pandas extra py-macos-3.9-aws.	2m 27s
Test modin-ubuntu-latest-64-cores-3.10-azure	30m 53s
Test py-ubuntu-latest-64-cores-3.13-aws	22m 49s
Test py-ubuntu-latest-64-cores-3.12-azure	23m 59s
Test py-ubuntu-latest-64-cores-3.12-gcp	22m 45s
Test modin-windows-latest-64-cores-3.11-gcp	32m 27s
Test py-macos-latest-3.12-azure	31m 36s
Test modin-ubuntu-latest-64-cores-3.12-aws	29m 2s
Test py-ubuntu-latest-64-cores-3.9-aws	21m 29s
Doctest AST (phase0) py-macos-latest-3.9	25m 59s
Test Local Testing Module py-ubuntu-latest-3.13	7m 1s
Test modin-macos-latest-3.9-aws	33m 12s
Test py-windows-latest-64-cores-3.13-gcp	29m 12s
Combine coverage	1m 25s
	6h 1m 30s

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