[vpj] Improve error handling in VeniceVsonFileIterator and add tests #3798

Job	Run time
StaticAnalysis (17)	5m 0s
Controller / UT & CodeCov (8)	5m 27s
Internal / UT & CodeCov (8)	6m 48s
Router / UT & CodeCov (8)	2m 24s
Controller / UT & CodeCov (11)	5m 39s
Internal / UT & CodeCov (11)	6m 38s
Clients / UT & CodeCov (8)	11m 34s
Router / UT & CodeCov (11)	2m 19s
Controller / UT & CodeCov (17)	5m 21s
Internal / UT & CodeCov (17)	6m 29s
Clients / UT & CodeCov (11)	11m 45s
Router / UT & CodeCov (17)	2m 9s
Clients / UT & CodeCov (17)	11m 37s
Server / UT & CodeCov (8)	1h 0m 18s
Server / UT & CodeCov (11)	9m 42s
Server / UT & CodeCov (17)	8m 34s
ValidateGradleWrapper	12s
StaticAnalysisAndUnitTestsCompletionCheck	1s
	2h 41m 57s

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