Respect server capabilities on queries (#33538)

Closes https://github.com/zed-industries/zed/issues/33522

Turns out a bunch of Zed requests were not checking their capabilities
correctly, due to odd copy-paste and due to default that assumed that
the capabilities are met.

Adjust the code, which includes the document colors, add the test on the
colors case.

Release Notes:

- Fixed excessive document colors requests for unrelated files

crates/remote_server/src/remote_editing_tests.rs

@@ -422,7 +422,12 @@ async fn test_remote_lsp(cx: &mut TestAppContext, server_cx: &mut TestAppContext
             "Rust",
             FakeLspAdapter {
                 name: "rust-analyzer",
-                ..Default::default()
+                capabilities: lsp::ServerCapabilities {
+                    completion_provider: Some(lsp::CompletionOptions::default()),
+                    rename_provider: Some(lsp::OneOf::Left(true)),
+                    ..lsp::ServerCapabilities::default()
+                },
+                ..FakeLspAdapter::default()
             },
         )
     });
@@ -430,7 +435,11 @@ async fn test_remote_lsp(cx: &mut TestAppContext, server_cx: &mut TestAppContext
     let mut fake_lsp = server_cx.update(|cx| {
         headless.read(cx).languages.register_fake_language_server(
             LanguageServerName("rust-analyzer".into()),
-            Default::default(),
+            lsp::ServerCapabilities {
+                completion_provider: Some(lsp::CompletionOptions::default()),
+                rename_provider: Some(lsp::OneOf::Left(true)),
+                ..lsp::ServerCapabilities::default()
+            },
             None,
         )
     });