Remove two Schema related search commands from the Command Palette. (#883)

- These commands are associated with AWS Explorer node context menus, and operate against explorer nodes. They weren't intended to appear in the Command Palette.

Author: awschristou

package.json

@@ -169,6 +169,14 @@
                     "command": "aws.viewSchemaItem",
                     "when": "false"
                 },
+                {
+                    "command": "aws.searchSchema",
+                    "when": "false"
+                },
+                {
+                    "command": "aws.searchSchemaPerRegistry",
+                    "when": "false"
+                },
                 {
                     "command": "aws.refreshAwsExplorer",
                     "when": "false"