fix: set resolveProvider to false in init handler json and yaml language servers (#2391)

Problem
Currently, both the JSON and YAML generic language servers respond with resolveProvider: true in their initialization response. This signals to clients that these language servers support completion item resolve requests, which these servers don't actually support, resulting in errors when clients send resolve requests.

Solution
This updates resolveProvider to false to accurately describe the capabilities of these language servers.
Co-authored-by: Alice Koreman <[email protected]>

Author: akoreman

server/aws-lsp-json/src/language-server/jsonServer.ts

@@ -36,7 +36,7 @@ export const JsonServerFactory =
         const onInitializeHandler = () => {
             return {
                 capabilities: {
-                    completionProvider: { resolveProvider: true },
+                    completionProvider: { resolveProvider: false },
                     hoverProvider: true,
                     documentFormattingProvider: true,
                     textDocumentSync: {

server/aws-lsp-yaml/src/language-server/yamlServer.ts

@@ -36,7 +36,7 @@ export const YamlServerFactory =
         const onInitializeHandler = () => {
             return {
                 capabilities: {
-                    completionProvider: { resolveProvider: true },
+                    completionProvider: { resolveProvider: false },
                     hoverProvider: true,
                     documentFormattingProvider: true,
                     textDocumentSync: {