removes ploomber-extension #5605

Job	Run time
preliminary	17s
check	10s
test-sqlalchemy-v1 (3.11, ubuntu-latest)	2m 25s
test (3.8, ubuntu-latest)	2m 55s
test-sqlalchemy-v1 (3.11, macos-latest)	1m 40s
test (3.8, macos-latest)	2m 30s
test-sqlalchemy-v1 (3.11, windows-latest)	4m 2s
test (3.8, windows-latest)	4m 39s
test (3.9, ubuntu-latest)	2m 52s
test (3.9, macos-latest)	1m 57s
test (3.9, windows-latest)	4m 15s
test (3.10, ubuntu-latest)	2m 39s
test (3.10, macos-latest)	2m 8s
test (3.10, windows-latest)	5m 9s
test (3.11, ubuntu-latest)	2m 27s
test (3.11, macos-latest)	1m 41s
test (3.11, windows-latest)	3m 57s
integration-test-non-live / database-integration-test (3.11, ubuntu-latest)	7m 41s
release	0s
	53m 24s

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