prog: add ProgramOptions.LogSizeStart to obtain full log after verifi… #1463

Job	Run time
Build Documentation	19s
Build and Lint	2m 23s
Run tests on arm64	53s
Run tests on previous stable Go	1m 55s
Run tests (mainline)	1m 3s
Run tests (stable)	53s
Run tests (6.6)	56s
Run tests (6.1)	1m 5s
Run tests (5.15)	1m 41s
Run tests (5.10)	1m 3s
Run tests (5.4)	1m 9s
Run tests (4.19)	59s
Run tests (4.14)	2m 3s
Run tests (4.9)	1m 0s
	17m 22s

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