fix(@schematics/angular): improve pipe signature

[LakhyariMs]

Currently , the CLI generates :

transform(value: any , args?: any)

With this commit , it generate :

transform(value: any, ...args?: any[])

Which conforms to the official doc

Fixes #12602

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[LakhyariMs]

I signed it!

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[cexbrayat]

Note to the team: this is a first time contributor, contributing to the CLI during the HackCommitPush conference, which aims to help developers to contribute to open source projects :)

The CI flake looks unrelated (failure in analytics_spec.ts)

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