minor #61991 remove getNamespace() and getXsdValidationBasePath() from ExtensionInterface (xabbuh)

This PR was merged into the 8.0 branch.

Discussion
----------

 remove getNamespace() and getXsdValidationBasePath() from ExtensionInterface

| Q             | A
| ------------- | ---
| Branch?       | 8.0
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

finishes #61986

Commits
-------

cd9e8679dcb remove getNamespace() and getXsdValidationBasePath() from ExtensionInterface

Author: nicolas-grekas

Tests/Compiler/MergeExtensionConfigurationPassTest.php

@@ -32,12 +32,6 @@ public function testExpressionLanguageProviderForwarding()
         $tmpProviders = [];
 
         $extension = $this->createMock(ExtensionInterface::class);
-        $extension->expects($this->any())
-            ->method('getXsdValidationBasePath')
-            ->willReturn(false);
-        $extension->expects($this->any())
-            ->method('getNamespace')
-            ->willReturn('http://example.org/schema/dic/foo');
         $extension->expects($this->any())
             ->method('getAlias')
             ->willReturn('foo');