chore: 🤖 fix clutter in test terminal output

[chimurai]

fix terminal console warnings and errors when running tests:

• fix jest "ERROR ReferenceError: IntersectionObserver is not defined"
  • Use same mock from vitest:

    spectator/projects/spectator/setup-vitest.ts

    Lines 17 to 25 in 691c476

    	beforeEach(() => {
    	const mockIntersectionObserver = vi.fn();
    	mockIntersectionObserver.mockReturnValue({
    	observe: () => null,
    	unobserve: () => null,
    	disconnect: () => null,
    	});
    	window.IntersectionObserver = mockIntersectionObserver;
    	});

• fix NG0912: Component ID generation collision detected (https://angular.dev/errors/NG0912)

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngneat/spectator/blob/master/CONTRIBUTING.md#commit
• 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)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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