chore(td-tools): enable eslint/strict-boolean-expressions and strictNullChecks #1942

Job	Run time
setup-and-test (ubuntu-latest, 18.x)	27m 23s
setup-and-test (ubuntu-latest, 20.x)	27m 19s
eslint	1m 46s
Check version consistency of packages	10s
Check coding style	13s
	56m 51s

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