internal/chartconfig: add counter: gopls/client:{helix,zed}

Fixes golang/go#75332

Change-Id: If472e4d337d18397ea6dd6e747dc0cb72670f12c
Reviewed-on: https://go-review.googlesource.com/c/telemetry/+/741120
Auto-Submit: Hongxiang Jiang <hxjiang@golang.org>
Reviewed-by: Madeline Kalil <mkalil@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

internal/chartconfig/config.txt

diff --git a/internal/chartconfig/config.txt b/internal/chartconfig/config.txt
index 3968607..56d080b 100644
--- a/internal/chartconfig/config.txt
+++ b/internal/chartconfig/config.txt
@@ -2,7 +2,7 @@
 # For the chart config file format, see chartconfig.go.
 
 title: Editor Distribution
-counter: gopls/client:{vscode,vscodium,vscode-insiders,code-server,eglot,govim,neovim,coc.nvim,sublimetext,windsurf,cursor,other}
+counter: gopls/client:{vscode,vscodium,vscode-insiders,code-server,eglot,govim,neovim,coc.nvim,sublimetext,windsurf,cursor,helix,zed,other}
 description: measure editor distribution for gopls users.
 type: partition
 issue: https://go.dev/issue/61038