fix(@schematics/angular): Spec standalone check (defaults to true now) (#31035)

[PieterjanDeClippel]

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular-cli/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Generating component => specfile has component in declarations array instead of imports

See SO question

Linked isssues

• Closes Template for standalone-component-spec is wrong #31035

What is the new behavior?

• false => declarations
• true or undefined => imports

Does this PR introduce a breaking change?

• Yes
• No

Other information

[alan-agius4]

Please see: #31035 (comment)

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