perf: unnecessary rpc call when coverage is disabled

[AriPerkkio]

Description

• Small improvement to reduce rpc calls when we know they are unnecessary

Browser runner already does this:

vitest/packages/browser/src/client/runner.ts

Lines 45 to 56 in bdce0a2

	onAfterRunFiles = async (files: File[]) => {
	await super.onAfterRunFiles?.(files)
	const coverage = await coverageModule?.takeCoverage?.()
	if (coverage) {
	await rpc().onAfterSuiteRun({
	coverage,
	transformMode: 'web',
	projectName: this.config.name,
	})
	}
	}

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• 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.
• Ideally, include a test that fails without this PR but passes with it.
• Please, don't make changes to pnpm-lock.yaml unless you introduce a new test example.

Tests

• Run the tests with pnpm test:ci.

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

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:.

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