Extract mutable builder from `ModuleScope` #25400

Job	Run time
Cancel Previous Runs	3s
Engine (GraalVM CE) (linux, x86_64)	30m 27s
Engine (GraalVM CE) (macos, x86_64)	20m 54s
Engine (GraalVM CE) (windows, x86_64)	13m 17s
JVM Tests (GraalVM CE) (linux, x86_64)	32m 39s
JVM Tests (GraalVM CE) (windows, x86_64)	55m 0s
JVM Tests (GraalVM CE) (macos, x86_64)	1h 1m 44s
Standard Library Tests (GraalVM CE) (linux, x86_64)	30m 27s
Standard Library Tests (GraalVM CE) (macos, x86_64)	35m 28s
Standard Library Tests (GraalVM CE) (windows, x86_64)	34m 30s
Verify License Packages (linux, x86_64)	2m 16s
	5h 16m 45s

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