refactor(test): use minimal config objects

[RahulGautamSingh]

Changes

Context

• Ref: test: reduce the usage of defaultConfig #20619

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I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
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[RahulGautamSingh]

renovate/lib/config/options/index.ts

Lines 716 to 722 in 1292e75

	name: 'skipInstalls',
	description:
	'Skip installing modules/dependencies if lock file updating is possible without a full install.',
	type: 'boolean',
	default: null,
	globalOnly: true,
	},

How to update the type in options as RenovateOptions only allow boolean|array|object|string|number?

[renovate-release]

🎉 This PR is included in version 35.14.1 🎉

The release is available on:

• GitHub release
• 35.14.1

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