overlaygen: cap max sparse file size #4137

Job	Run time
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.12...	58s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	1m 23s
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.9,...	52s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	1m 17s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.9, ...	58s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	1m 32s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.6, ...	1m 6s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	3m 27s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 3.6, ...	1m 21s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 3...	4m 14s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 2.7, ...	1m 34s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 2...	6m 49s
	25m 31s

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