fix(browser): support `fileParallelism` on an instance (#9328)

fix(browser): support `fileParallelism` on an instance (#9328) · vitest-dev/vitest@1500654

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Original file line number	Diff line number	Diff line change
`@@ -253,6 +253,7 @@ function cloneConfig(project: TestProject, { browser, ...config }: BrowserInstan`
`253`	`253`	`headless,`
`254`	`254`	`screenshotDirectory,`
`255`	`255`	`screenshotFailures,`
	`256`	`+ fileParallelism,`
`256`	`257`	`// @ts-expect-error remove just in case`
`257`	`258`	`browser: _browser,`
`258`	`259`	`name,`
`@@ -276,6 +277,7 @@ function cloneConfig(project: TestProject, { browser, ...config }: BrowserInstan`
`276`	`277`	`screenshotFailures: screenshotFailures ?? currentConfig.screenshotFailures,`
`277`	`278`	`headless: headless ?? currentConfig.headless,`
`278`	`279`	`provider: provider ?? currentConfig.provider,`
	`280`	`+fileParallelism: fileParallelism ?? currentConfig.fileParallelism,`
`279`	`281`	`name: browser,`
`280`	`282`	`instances: [], // projects cannot spawn more configs`
`281`	`283`	`},`

Original file line number	Diff line number	Diff line change
`@@ -533,6 +533,29 @@ test('provider options can be changed dynamically in CLI', async () => {`
`533`	`533`	`})`
`534`	`534`	`})`
`535`	`535`
	`536`	`+test('fileParallelism on the instance works properly', async () => {`
	`537`	`+const v = await vitest({}, {`
	`538`	`+fileParallelism: true,`
	`539`	`+browser: {`
	`540`	`+enabled: true,`
	`541`	`+provider: playwright(),`
	`542`	`+instances: [`
	`543`	`+{`
	`544`	`+browser: 'chromium',`
	`545`	`+fileParallelism: false,`
	`546`	`+},`
	`547`	`+{`
	`548`	`+browser: 'firefox',`
	`549`	`+fileParallelism: true,`
	`550`	`+},`
	`551`	`+],`
	`552`	`+},`
	`553`	`+})`
	`554`	`+expect(v.projects).toHaveLength(2)`
	`555`	`+expect(v.projects[0].config.browser.fileParallelism).toBe(false)`
	`556`	`+expect(v.projects[1].config.browser.fileParallelism).toBe(true)`
	`557`	`+})`
	`558`	`+`
`536`	`559`	`function getCliConfig(options: TestUserConfig, cli: string[], fs: TestFsStructure = {}) {`
`537`	`560`	const root = resolve(process.cwd(), `vitest-test-${crypto.randomUUID()}`)
`538`	`561`	`useFS(root, {`