test: refactor coverage snapshot tests

[AriPerkkio]

Description

• Split from feat(coverage): v8 experimental AST-aware remapping #7736

Compare coverage summaries instead of coverage maps.

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• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
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Tests

• Run the tests with pnpm test:ci.

Documentation

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Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.

[Copilot]

Pull Request Overview

This pull request refactors the coverage snapshot tests to compare coverage summaries rather than full coverage maps.

• Updates the pre-transpiled source test to use inline snapshots for verifying the list of files and file coverage details.
• Modifies the bundled sources test to import and use a new summary formatting function and verifies coverage summaries via inline snapshots.

Reviewed Changes

Copilot reviewed 2 out of 6 changed files in this pull request and generated no comments.

File	Description
test/coverage-test/test/pre-transpiled-source.test.ts	Replaces multiple file-existence assertions with an inline snapshot, and adds inline snapshots for file coverage details based on coverage provider.
test/coverage-test/test/bundled-sources.test.ts	Updates import statements to include formatSummary; replaces multiple file-existence assertions with an inline snapshot; and validates coverage summaries for bundled sources across providers.

Files not reviewed (4)

• test/coverage-test/test/snapshots/bundled-istanbul.snapshot.json: Language not supported
• test/coverage-test/test/snapshots/bundled-v8.snapshot.json: Language not supported
• test/coverage-test/test/snapshots/pre-transpiled-istanbul.snapshot.json: Language not supported
• test/coverage-test/test/snapshots/pre-transpiled-v8.snapshot.json: Language not supported

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