selenium: Upgrade WebdriverIO to v7

Update npm packages: @wdio/* and webdriverio.

Bug: T274579
Change-Id: Ie9bd50e36f0c888a19e73ab9b424a8b6a5bd67fd

.babelrc

@@ -1,6 +1,9 @@
 {
 	"presets": ["@babel/preset-env"],
 	"plugins": [
+		["@babel/transform-runtime", {
+			"regenerator": true
+		}],
 		["@babel/plugin-proposal-private-property-in-object", {
 		"loose": true
 	  }]

.nycrc.json

@@ -15,7 +15,7 @@
 	"//": "Set the coverage percentage by category thresholds.",
 	"statements": 85,
 	"branches": 72,
-	"functions": 84,
+	"functions": 83,
 	"lines": 90,
 
 	"//": "Fail if the coverage is below threshold.",

package.json

@@ -27,16 +27,17 @@
 	},
 	"devDependencies": {
 		"@babel/core": "7.2.0",
+		"@babel/plugin-transform-runtime": "7.15.0",
 		"@babel/preset-env": "7.2.0",
 		"@babel/register": "7.0.0",
 		"@storybook/html": "6.2.9",
 		"@types/jquery": "3.3.29",
-		"@wdio/cli": "6.3.5",
-		"@wdio/junit-reporter": "6.1.5",
-		"@wdio/local-runner": "6.3.5",
-		"@wdio/mocha-framework": "6.3.0",
-		"@wdio/dot-reporter": "6.3.0",
-		"@wdio/sync": "6.3.3",
+		"@wdio/cli": "7.4.6",
+		"@wdio/dot-reporter": "7.4.2",
+		"@wdio/junit-reporter": "7.4.2",
+		"@wdio/local-runner": "7.4.6",
+		"@wdio/mocha-framework": "7.4.6",
+		"@wdio/sync": "7.4.6",
 		"@wikimedia/mw-node-qunit": "6.1.0",
 		"babel-loader": "8.0.4",
 		"browserslist-config-wikimedia": "0.2.0",
@@ -61,7 +62,7 @@
 		"tap-mocha-reporter": "5.0.1",
 		"url-loader": "1.1.2",
 		"wdio-mediawiki": "1.1.1",
-		"webdriverio": "6.3.5",
+		"webdriverio": "7.4.6",
 		"webpack": "4.44.2",
 		"webpack-cli": "3.1.2"
 	},