Improve NetworkAdminService Code Coverage

[povolev15]

Add more unit tests to improve code coverage to each class in Network Admin 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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CODEC

• MonoSpecialFilesAdapterCodec [85 %]

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HANDLERS

• FreezeHandler [93%]
• FreezeUpgradeActions [100 %]
• NetworkAdminHandlers [0%] #13196
• NetworkGetAccountDetailsHandler [93 %]
• NetworkGetByKeyHandler [100 %]
• NetworkGetExecutionTimeHandler [100 %]
• NetworkGetVersionInfoHandler [92 %]
• NetworkTransactionGetFastRecordHandler [100 %]
• NetworkTransactionGetReceiptHandler [93 %]
• NetworkTransactionGetRecordHandler [64%] #13271
• NetworkUncheckedSubmitHandler NetworkAdmin Service Handlers > 80% #13272
• ReadableFreezeUpgradeActions [58%] #13273
• UnzipUtility NetworkAdmin Service Handlers > 80% #13272

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SCHEMAS

• InitialModServiceAdminSchema[77 %] #13293
• InitialModServiceNetworkSchema [0%] #13294

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SERDES

• EntityNumCodec [85 %]
• MonoContextAdapterCodec [83%]
• MonoRunningHashesAdapterCodec [85%]

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UTILS

• NetworkAdminServiceUtil [66%] #13287

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BASE PACKAGE

• FreezeServiceImpl [100%]
• NetworkServiceImpl [0 %] #13290
• ReadableFreezeStoreImpl [62 %] #13705
• WritableFreezeStore [100 %]

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hedera-network-admin-service module

• FreezeServiceDefinition [0%] #13727
• NetworkServiceDefinition [0%] #13728