goLanguageServer: attach gopls version to issue reports

Change-Id: Id902a44dc7f91b198c7cc4c36c783b66817a2ecb
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/251082
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>

src/goLanguageServer.ts

@@ -1040,8 +1040,12 @@ You will be asked to provide additional information and logs, so PLEASE READ THE
  errKind = 'initialization';
  break;
  }
+ const usersGoplsVersion = await getLocalGoplsVersion(latestConfig);
  const title = `gopls: automated issue report (${errKind})`;
- const body = `ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.
+ const body = `
+gopls version: ${usersGoplsVersion}
+
+ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.
 
 Describe what you observed.