Fix Change Password Flaky Test (#245443)

Closes: #241763

## Summary

Attempt to fix the flaky test for changing a user's password.
Changed the click that submits to form the `clickWhenNotDisabled`

Co-authored-by: Elena Shostak <[email protected]>

Author: rgodfrey-elastic

x-pack/platform/test/functional/page_objects/account_settings_page.ts

@@ -38,7 +38,7 @@ export class AccountSettingsPageObject extends FtrService {
     await confirmPasswordInput.clearValue();
     await confirmPasswordInput.type(newPassword);
 
-    await this.testSubjects.click('changePasswordFormSubmitButton');
+    await this.testSubjects.clickWhenNotDisabled('changePasswordFormSubmitButton');
 
     const toast = await this.testSubjects.find('euiToastHeader', 20000);
     const title = await toast.getVisibleText();