Remove hide clangd property and preference pages

The hiding of the properties page should be done by vendors and not in
this plugin.

bundles/org.eclipse.cdt.lsp.clangd/META-INF/MANIFEST.MF

@@ -29,8 +29,7 @@ Require-Bundle: org.eclipse.cdt.lsp;bundle-version="0.0.0",
  org.eclipse.ui.editors;bundle-version="0.0.0",
  org.eclipse.ui.ide;bundle-version="0.0.0",
  org.eclipse.ui.workbench;bundle-version="0.0.0",
- org.eclipse.ui.workbench.texteditor;bundle-version="0.0.0",
- org.eclipse.ui;bundle-version="0.0.0"
+ org.eclipse.ui.workbench.texteditor;bundle-version="0.0.0"
 Bundle-Activator: org.eclipse.cdt.lsp.internal.clangd.editor.ClangdPlugin
 Service-Component: OSGI-INF/org.eclipse.cdt.lsp.clangd.BuiltinClangdOptionsDefaults.xml,
  OSGI-INF/org.eclipse.cdt.lsp.internal.clangd.ClangdConfigurationAccess.xml,

bundles/org.eclipse.cdt.lsp.clangd/plugin.xml

@@ -58,13 +58,6 @@
             properties="active"
             type="java.lang.Object">
       </propertyTester>
-      <propertyTester
-            class="org.eclipse.cdt.lsp.internal.clangd.editor.expressions.ClangdLanguageServerProviderActive"
-            id="org.eclipse.cdt.lsp.clangd.provider.active"
-            namespace="org.eclipse.cdt.lsp.clangd.provider"
-            properties="active"
-            type="java.lang.Object">
-      </propertyTester>
    </extension>
    <extension
          point="org.eclipse.cdt.lsp.serverProvider">
@@ -120,22 +113,5 @@
          </command>
       </menuContribution>
    </extension>
-   <extension
-         point="org.eclipse.ui.activities">
-      <activity
-            id="org.eclipse.cdt.lsp.clangd.ClangdLanguageProvider"
-            name="CDT Clangd Language Server Provider">
-         <enabledWhen>
-            <test
-                  forcePluginActivation="true"
-                  property="org.eclipse.cdt.lsp.clangd.provider.active">
-            </test></enabledWhen>
-      </activity>
-      <activityPatternBinding
-            activityId="org.eclipse.cdt.lsp.clangd.ClangdLanguageProvider"
-            isEqualityPattern="false"
-            pattern="org.eclipse.cdt.lsp.clangd/org.eclipse.cdt.lsp.clangd.editor.*">
-      </activityPatternBinding>
-   </extension>
 
 </plugin>