examples: update some examples to use the new task execution engine #1049

Job	Run time
linting-and-style-checks (3.9, black)	24s
linting-and-style-checks (3.9, flake8)	24s
linting-and-style-checks (3.9, gitlint)	36s
linting-and-style-checks (3.9, isort)	28s
linting-and-style-checks (3.9, mypy)	1m 11s
unit-tests (ubuntu-20.04, 3.9, clean,py39-pytest-cov,report)	2m 42s
unit-tests (ubuntu-20.04, 3.9, py39-cookiecutter)	47s
unit-tests (ubuntu-20.04, 3.10, clean,py310-pytest-cov,report)	2m 25s
unit-tests (ubuntu-20.04, 3.10, py310-cookiecutter)	42s
unit-tests (windows-latest, 3.9, clean,py39-pytest-cov,report)	4m 52s
unit-tests (windows-latest, 3.9, py39-cookiecutter)	1m 3s
unit-tests (windows-latest, 3.10, clean,py310-pytest-cov,report)	4m 38s
unit-tests (windows-latest, 3.10, py310-cookiecutter)	47s
	20m 59s

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