Rename `CredentialValidator` to `JwtCredentialValidator` #4467

Job	Run time
check-for-run-condition	1s
check-for-modification	5s
build-wasm / build-wasm (ubuntu-latest)	2m 40s
build-and-test (ubuntu-latest)	15m 21s
build-and-test (macos-latest)	11m 44s
build-and-test (windows-latest)	18m 56s
test-wasm (ubuntu-latest)	8m 2s
	56m 49s

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