Use DefaultValue for default value of InputValueDefinition #7057

Job	Run time
Rust Tests (ubuntu-latest)	5m 26s
Compiler output check (ubuntu-latest)	4m 31s
Rust Tests (macos-latest)	5m 28s
Build Rust Compiler (ubuntu-latest)	4m 4s
Compiler output check (macos-latest)	10m 58s
JS Lint	54s
Rust Tests (windows-latest)	6m 0s
Build Rust Compiler (ubuntu-latest)	5m 21s
Build Rust Compiler (macos-latest)	4m 8s
Build Rust Compiler (macos-latest)	5m 24s
JS Tests (Node 14.x)	1m 27s
Rust Lint	13s
Build Rust Compiler (windows-latest)	6m 3s
Flow Typecheck	37s
JS Tests (Node 16.x)	1m 31s
VSCode Extension Lint	18s
Publish to NPM	0s
	1h 2m 23s

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