fix: ensure @cypress/schematic is installed as devDependency

[admah]

• close issue schematic : should be installed as a devDependency #16954
• closing PR fix: Have @cypress/schematic install as devDependency by default #16956 in favor of this one.

User Facing Changelog

• Update package.json to ensure schematic is installed as devDependency

Additional Details

Use the save option of ng-add to configure if the library should be added to the dependencies, the devDepedencies, or not saved at all in the project's package.json configuration file. https://angular.io/guide/schematics-for-libraries#define-dependency-type

• Not sure if there’s a way y’all have set up already to test this.

[cypress-bot]

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[cypress]

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Test summary

8161 • 0 • 100 • 4 • 0

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Run details

Project	cypress
Status	Passed
Commit	7f6de3b
Started	Jun 17, 2021 4:48 PM
Ended	Jun 17, 2021 4:58 PM
Duration	10:11 💡
OS	Linux Debian - 10.8
Browser	Multiple

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