fix: disable codecatalyst manageConnections from command palette (aws#4782)

Problem:
- toolkit auth and codecatalyst manageConnections both show "Add New Connection" in the command palette

Solution:
- we can hide codecatalyst manageConnections because it's a wrapper around the toolkit auth command that sets the source

Author: jpinkney-aws

packages/core/package.json

@@ -795,6 +795,10 @@
                     "command": "aws.codecatalyst.listCommands",
                     "when": "false"
                 },
+                {
+                    "command": "aws.codecatalyst.manageConnections",
+                    "when": "false"
+                },
                 {
                     "command": "aws.codecatalyst.openDevEnv",
                     "when": "!isCloud9"