minor #51499 [Security] Remove isAuthenticated and setAuthenticated token methods in tests (alamirault)

This PR was merged into the 6.3 branch.

Discussion
----------

[Security] Remove `isAuthenticated` and `setAuthenticated` token methods in tests

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->

`isAuthenticated` and `setAuthenticated` methods are not in TokenInterface anymore, so we can remove it in tests

Commits
-------

9df0a3f1a2 [Security] Remove isAuthenticated and setAuthenticated token methods in tests

Author: fabpot

Tests/Firewall/ContextListenerTest.php

@@ -563,15 +563,6 @@ public function getUserIdentifier(): string
         return $this->getUserIdentifier();
     }
 
-    public function isAuthenticated(): bool
-    {
-        return true;
-    }
-
-    public function setAuthenticated(bool $isAuthenticated)
-    {
-    }
-
     public function eraseCredentials(): void
     {
     }