Improve ScheduleService Code Coverage

[povolev15]

Add more unit tests to improve code coverage to each class in the Schedule Service

1. Checked box without issue indicates False negative for coverage where codacy reports 0% coverage but test exists.
2. Checked box with Issue indicates the associated issue has been addressed.
3. List items in bold represent classes falling below 80% coverage and targeted for improvement

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Schedule

• [ ] ScheduleService [0 %] – #13216

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CODEC

• [ ] ScheduleServiceStateTranslator [84%]

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HANDLERS

• [ ] AbstractScheduleHandler [94%]
• [ ] DispatchPredicate [75 %]
• [ ] HandlerUtility [93 %]
• [ ] ScheduleCreateHandler [81 %]
• [ ] ScheduleDeleteHandler [79 %]
• [ ] ScheduleGetInfoHandler [86 %]
• [ ] ScheduleHandlers [0 %]
• [ ] ScheduleSignHandler [80 %]
• [ ] ScheduleVerificationAssistant [91 %]

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SCHEMAS

• [ ] InitialModServiceScheduleSchema[9 %]

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BASE PACKAGE

• [ ] ReadableScheduleStoreImpl [97 %] – #13216
• [ ] ScheduleServiceImpl [60 %] – #13216
• [ ] ScheduleStoreUtility [97 %] – #13216
• [ ] WritableScheduleStoreImpl [92 %] – #13216