Stabilize e2e tests for phishing detection (#21152)

## **Description**
Several e2e testcases about phishing detection are flaky.

## **Why they are flaky?**
After investigation, i think because when we open a malicious website,
selenium fetch very quickly all the DOM elements and consider they are
complete. When the page redirects to phishing detection page, it dose
not re-fetch elements so selenium cannot find buttons to click.

## **How i resolve it?**
I explicitly force selenium to switch to the phishing detection page
each time after redirection so it will re-fetch all elements on this
page.

## **Why do i think the fix works**
For each testcase, I ran locally 20 times and they all passed.

Fixes #21150

test/e2e/tests/phishing-controller/phishing-detection.spec.js

@@ -58,6 +58,7 @@ describe('Phishing Detection', function () {
         await driver.fill('#password', 'correct horse battery staple');
         await driver.press('#password', driver.Key.ENTER);
         await openDapp(driver);
+        await driver.switchToWindowWithTitle('MetaMask Phishing Detection');
         await driver.clickElement({
           text: 'continue to the site.',
         });
@@ -177,6 +178,7 @@ describe('Phishing Detection', function () {
         await driver.press('#password', driver.Key.ENTER);
         await openDapp(driver);
 
+        await driver.switchToWindowWithTitle('MetaMask Phishing Detection');
         await driver.clickElement({ text: 'report a detection problem.' });
 
         // wait for page to load before checking URL.
@@ -215,6 +217,7 @@ describe('Phishing Detection', function () {
         await driver.press('#password', driver.Key.ENTER);
         await driver.openNewPage(phishingSite.href);
 
+        await driver.switchToWindowWithTitle('MetaMask Phishing Detection');
         await driver.clickElement({ text: 'report a detection problem.' });
 
         // wait for page to load before checking URL.
@@ -252,6 +255,7 @@ describe('Phishing Detection', function () {
         await driver.press('#password', driver.Key.ENTER);
         await driver.openNewPage('http://127.0.0.1:8080');
 
+        await driver.switchToWindowWithTitle('MetaMask Phishing Detection');
         await driver.clickElement({ text: 'report a detection problem.' });
 
         // wait for page to load before checking URL.