`MetadataStorage` is mutable - structural equals in `copy` isn't enough #30677

Job	Run time
Cancel Previous Runs	2s
Engine (GraalVM CE) (linux, amd64)	30m 21s
Engine (GraalVM CE) (macos, amd64)	49m 55s
Engine (GraalVM CE) (windows, amd64)	18m 57s
JVM Tests (GraalVM CE) (linux, amd64)	30m 17s
JVM Tests (GraalVM CE) (macos, amd64)	54m 38s
JVM Tests (GraalVM CE) (windows, amd64)	49m 32s
Standard Library Tests (GraalVM CE) (linux, amd64)	19m 30s
Standard Library Tests (GraalVM CE) (macos, amd64)	53m 0s
Standard Library Tests (GraalVM CE) (windows, amd64)	27m 35s
Verify License Packages (linux, amd64)	1m 35s
	5h 35m 22s

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