Use vitest globals (#27102)

Enable [globals](https://vitest.dev/config/#globals) in vitest, reducing
the noise in test files.

web_src/js/features/common-issue-list.test.js

@@ -1,4 +1,3 @@
-import {test, expect} from 'vitest';
 import {parseIssueListQuickGotoLink} from './common-issue-list.js';
 
 test('parseIssueListQuickGotoLink', () => {

web_src/js/features/repo-code.test.js

@@ -1,4 +1,3 @@
-import {test, expect} from 'vitest';
 import {singleAnchorRegex, rangeAnchorRegex} from './repo-code.js';
 
 test('singleAnchorRegex', () => {

web_src/js/features/repo-findfile.test.js

@@ -1,4 +1,3 @@
-import {describe, expect, test} from 'vitest';
 import {strSubMatch, calcMatchedWeight, filterRepoFilesWeighted} from './repo-findfile.js';
 
 describe('Repo Find Files', () => {

web_src/js/modules/fetch.test.js

@@ -1,4 +1,3 @@
-import {test, expect} from 'vitest';
 import {GET, POST, PATCH, PUT, DELETE} from './fetch.js';
 
 // tests here are only to satisfy the linter for unused functions

web_src/js/modules/toast.test.js

@@ -1,4 +1,3 @@
-import {test, expect} from 'vitest';
 import {showInfoToast, showErrorToast, showWarningToast} from './toast.js';
 
 test('showInfoToast', async () => {

web_src/js/render/ansi.test.js

@@ -1,4 +1,3 @@
-import {expect, test} from 'vitest';
 import {renderAnsi} from './ansi.js';
 
 test('renderAnsi', () => {

web_src/js/svg.test.js

@@ -1,4 +1,3 @@
-import {expect, test} from 'vitest';
 import {svg, SvgIcon, svgParseOuterInner} from './svg.js';
 import {createApp, h} from 'vue';
 

web_src/js/utils.test.js

@@ -1,4 +1,3 @@
-import {expect, test} from 'vitest';
 import {
   basename, extname, isObject, stripTags, parseIssueHref,
   parseUrl, translateMonth, translateDay, blobToDataURI,

web_src/js/utils/color.test.js

@@ -1,4 +1,3 @@
-import {test, expect} from 'vitest';
 import {useLightTextOnBackground} from './color.js';
 
 test('useLightTextOnBackground', () => {

web_src/js/utils/match.test.js

@@ -1,4 +1,3 @@
-import {test, expect} from 'vitest';
 import {matchEmoji, matchMention} from './match.js';
 
 test('matchEmoji', () => {

web_src/js/utils/url.test.js

@@ -1,4 +1,3 @@
-import {expect, test} from 'vitest';
 import {pathEscapeSegments} from './url.js';
 
 test('pathEscapeSegments', () => {