[*] refactor autonomous and remote tasks execution, fixes #584

[pashagolub]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 5463909463

• 102 of 103 (99.03%) changed or added relevant lines in 5 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+1.6%) to 94.396%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/pgengine/transaction.go	71	72	98.61%

Files with Coverage Reduction	New Missed Lines	%
internal/scheduler/chain.go	3	85.53%
internal/scheduler/interval_chain.go	3	83.56%

Totals
Change from base Build 5455496127:	1.6%
Covered Lines:	1617
Relevant Lines:	1713

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💛 - Coveralls