fix: improve errors when unmarshalling config/secrets #4782

Job	Run time
Lint	1m 15s
Console	55s
Proto Breaking Change Check	11s
SQL	55s
Test Go	3m 13s
Test README	1m 52s
Rebuild All	1m 43s
Build Docs	5s
VSCode Extension	50s
Shard Integration Tests	6s
Integration Test (TestServiceWithRealDal)	2m 33s
Integration Test (TestCron)	2m 44s
Integration Test (TestFSM)	3m 29s
Integration Test (TestFSMRetry)	3m 1s
Integration Test (TestFSMGoTests)	2m 57s
Integration Test (TestHttpIngress)	2m 43s
Integration Test (TestLease)	2m 57s
Integration Test (TestPubSub)	2m 52s
Integration Test (TestConsumptionDelay)	3m 37s
Integration Test (TestRetry)	2m 53s
Integration Test (TestExternalPublishRuntimeCheck)	3m 36s
Integration Test (TestDatabase)	2m 50s
Integration Test (TestASMWorkflow)	2m 12s
Integration Test (TestASMPagination)	2m 11s
Integration Test (TestLeaderSync)	2m 40s
Integration Test (TestFollowerSync)	2m 12s
Integration Test (TestCmdsCreateProjectTomlFilesIfNonexistent)	2m 47s
Integration Test (TestDefaultToRootWhenModuleDirsMissing)	3m 5s
Integration Test (TestConfigCmdWithoutController)	2m 34s
Integration Test (TestFindConfig)	2m 53s
Integration Test (TestNonExportedDecls)	2m 51s
Integration Test (TestUndefinedExportedDecls)	2m 47s
Integration Test (TestHttpEncodeOmitempty)	3m 0s
Integration Test (TestLifecycle)	3m 1s
Integration Test (TestInterModuleCall)	3m 33s
Integration Test (TestSchemaGenerate)	2m 50s
Integration Test (TestModuleUnitTests)	3m 8s
Integration Test (TestFTLMap)	3m 27s
Integration Test (TestRuntimeReflection)	2m 51s
Integration Test (TestRealMap)	3m 26s
Integration Success	1s
	1h 38m 46s

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