Create backfill intermediate table only in backfill overwrite

[s-vitaliy]

Part of #100

Do not create backfill table if backfill mode is not Overwrite

[github-actions]

File	Coverage
All files	71%	✅
logging/ZIOLogAnnotations.scala	76%	✅
models/ArcaneSchema.scala	92%	✅
models/DataCell.scala	0%	❌
models/DataCell.scala	0%	❌
models/ArcaneSchema.scala	0%	❌
models/DataCell.scala	71%	✅
models/app/StreamContext.scala	0%	❌
models/cdm/SimpleCdmModel.scala	88%	✅
models/cdm/CdmParser.scala	89%	✅
models/cdm/CdmParser.scala	93%	✅
models/querygen/MergeQuerySegment.scala	88%	✅
models/querygen/MergeQuerySegment.scala	85%	✅
models/querygen/MergeQuery.scala	85%	✅
models/querygen/InitializeQuery.scala	0%	❌
models/settings/TablePropertiesSettings.scala	98%	✅
services/app/StreamRunnerServiceImpl.scala	0%	❌
services/app/PosixStreamLifetimeService.scala	0%	❌
services/cdm/CdmTableStream.scala	57%	✅
services/cdm/CdmSchemaProvider.scala	90%	✅
services/cdm/AzureBlobStorageReaderExtensions.scala	83%	✅
services/cdm/SynapseHookManager.scala	95%	✅
services/cdm/CdmTableStream.scala	83%	✅
services/consumers/SqlServerChangeTracking.scala	86%	✅
services/consumers/SqlServerChangeTracking.scala	90%	✅
services/filters/FieldsFilteringService.scala	90%	✅
services/hooks/manager/EmptyHookManager.scala	0%	❌
services/hooks/manager/EmptyHookManager.scala	0%	❌
services/lakehouse/IcebergS3CatalogWriter.scala	78%	✅
services/lakehouse/SchemaConversions.scala	28%	❌
services/lakehouse/IcebergCatalogCredential.scala	56%	✅
services/merging/JdbcMergeServiceClient.scala	35%	❌
services/merging/MutableSchemaCache.scala	97%	✅
services/merging/JdbcMergeServiceClient.scala	94%	✅
services/mssql/MsSqlDataProvider.scala	71%	✅
services/mssql/MsSqlDataProvider.scala	68%	✅
services/mssql/MsSqlStreamingDataProvider.scala	85%	✅
services/mssql/QueryProvider.scala	77%	✅
services/mssql/MsSqlConnection.scala	82%	✅
services/mssql/MsSqlHookManager.scala	0%	❌
services/mssql/query/ScalarQueryResult.scala	66%	✅
services/mssql/query/LazyQueryResult.scala	79%	✅
services/storage/models/amazon/AmazonS3StoragePath.scala	80%	✅
services/storage/models/azure/AdlsStoragePath.scala	81%	✅
services/storage/models/azure/AzureModelConversions.scala	98%	✅
services/storage/services/AzureBlobStorageReader.scala	65%	✅
services/streaming/base/StreamGraphBuilder.scala	0%	❌
services/streaming/processors/batch_processors/backfill/BackfillMergeBatchProcessor.scala	0%	❌
services/streaming/processors/batch_processors/backfill/BackfillDisposeBatchProcessor.scala	0%	❌
services/streaming/processors/batch_processors/streaming/DisposeBatchProcessor.scala	68%	✅
services/streaming/processors/transformers/StagingProcessor.scala	93%	✅
services/streaming/processors/transformers/FieldFilteringTransformer.scala	70%	✅
utils/SqlUtils.scala	50%	✅

Minimum allowed coverage is 40%

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