[*] run PROGRAM task for all parameters, fixes #741

[pashagolub]

Previously program task returned on the first fail. This is not how other kind of tasks behave. Make program task compatible with SQL and built-in tasks. All errors will be joined and returned

[coveralls]

Pull Request Test Coverage Report for Build 21175869918

Details

• 9 of 10 (90.0%) changed or added relevant lines in 1 file are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.09%) to 87.392%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/scheduler/shell.go	9	10	90.0%

Files with Coverage Reduction	New Missed Lines	%
internal/scheduler/shell.go	1	93.55%
internal/scheduler/interval_chain.go	2	84.06%

Totals
Change from base Build 21173629238:	0.09%
Covered Lines:	1726
Relevant Lines:	1975

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💛 - Coveralls