Display unmapped schema names in error messages #10772

Job	Run time
Generate Dump/Restore Tests	7s
Dump Restore Test using COPY for Instance-level-source_latest-target_latest - format=plain - type=full	44m 48s
Dump Restore Test using COPY for Instance-level-source_latest-target_latest - format=plain - type=schema-cum-data-only	41m 33s
Dump Restore Test using COPY for Database-level-source_latest-target_latest - format=custom - type=full	38m 41s
Dump Restore Test using INSERTS for Instance-level-source_latest-target_latest - format=tar - type=full	51m 4s
Dump Restore Test using INSERTS for Instance-level-source_latest-target_latest - format=custom - type=schema-cum-data-only	44m 54s
Dump Restore Test using INSERTS for Database-level-source_latest-target_latest - format=directory - type=schema-cum-data-only	43m 17s
Dump Restore Test using COPY for Database-level-15_5-15_5 - format=tar - type=full	24m 53s
Dump Restore Test using INSERTS for Database-level-16_1-16_1 - format=custom - type=full	26m 53s
	5h 16m 10s

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