Display unmapped schema names in error messages #10693

Job	Run time
Generate Dump/Restore Tests	6s
Dump Restore Test using COPY for Instance-level-source_latest-target_latest - format=plain - type=full	43m 30s
Dump Restore Test using COPY for Instance-level-source_latest-target_latest - format=plain - type=schema-cum-data-only	43m 2s
Dump Restore Test using COPY for Database-level-source_latest-target_latest - format=custom - type=full	38m 32s
Dump Restore Test using INSERTS for Instance-level-source_latest-target_latest - format=tar - type=full	49m 2s
Dump Restore Test using INSERTS for Instance-level-source_latest-target_latest - format=custom - type=schema-cum-data-only	41m 12s
Dump Restore Test using INSERTS for Database-level-source_latest-target_latest - format=directory - type=schema-cum-data-only	40m 41s
Dump Restore Test using COPY for Database-level-15_5-15_5 - format=tar - type=full	20m 17s
Dump Restore Test using INSERTS for Database-level-16_1-16_1 - format=custom - type=full	25m 14s
	5h 1m 36s

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