feat(@schematics/angular): set up fake timers in beforeEach instead of beforeAll

[yjaaidi]

When migrating fakeAsync to Vitest fake timers, fake timers were setup in beforeAll to support fakeAsync usage in beforeAll / afterAll hooks.
As brought up by @atscott, this was sacrificing timers isolation between tests.
This change resets fake timers between tests.
Any usage of fake timers APIs in beforeAll or afterAll hooks will fail.

PR Checklist

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• 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)
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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?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[gemini-code-assist]

Code Review

This pull request updates the Jasmine-to-Vitest transformer to use "beforeEach" and "afterEach" hooks instead of "beforeAll" and "afterAll" when setting up and tearing down fake timers. This change ensures that fake timers are correctly initialized and reset for every individual test within a suite. I have no feedback to provide as there were no review comments to evaluate.

[clydin]

This PR was merged into the repository. The changes were merged into the following branches:

• main: c9f4081

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