enhancement(changed): changed list logic in datasource by name

[uibm]

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Relates OR Closes #0000

Output from acceptance testing:

--- PASS: TestAccIBMIsFlowLogDataSourceBasic (186.73s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 190.093s

--- PASS: TestAccIBMISImageDataSource_basic (16.88s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 20.582s

--- PASS: TestAccIBMISInstanceDataSource_basic (255.15s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 258.555s

--- PASS: TestAccIBMISSnapshotDatasource_basic (283.86s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 287.361s

--- PASS: TestAccIBMISVirtualEndpointGatewayDataSource_basic (106.61s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 109.462s

--- PASS: TestAccIBMISVolumeDatasource_basic (87.11s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 90.943s

[hkantare]

Can you please share the result of testcases

[hkantare]

Please conflicts in the files