[Vertex AI] Remove `format` for `double()` `Schema` #740

Job	Run time
pod-lib-lint (ios, macos-14)	7m 41s
spm-package-resolved	1m 28s
sample (macos-13, Xcode_15.2)	2m 56s
testapp-integration (iOS, macos-15)	4m 40s
spm-unit (macos-13, Xcode_15.2, iOS)	6m 7s
sample (macos-14, Xcode_15.4)	3m 6s
spm-unit (macos-14, Xcode_15.4, iOS)	5m 48s
sample (macos-15, Xcode_16)	2m 3s
spm-unit (macos-15, Xcode_16, iOS)	2m 5s
spm-unit (macos-15, Xcode_16, tvOS)	2m 15s
spm-unit (macos-15, Xcode_16, macOS)	1m 43s
spm-unit (macos-15, Xcode_16, watchOS)	2m 3s
spm-unit (macos-15, Xcode_16, catalyst)	1m 48s
spm-unit (macos-15, Xcode_16, visionOS)	2m 15s
	45m 58s

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