Revert "chore: adds credential start url to mcp server init telemetry datum"

This reverts commit 13ecdb9.

Author: dingfeli

crates/aws-toolkit-telemetry-definitions/def.json

@@ -392,7 +392,6 @@
       "description": "Emitted once per mcp server on start up" ,
       "passive": false,
       "metadata": [
-        { "type": "credentialStartUrl" },
         { "type": "amazonqConversationId" },
         { "type": "codewhispererterminal_mcpServerInitFailureReason", "required": false },
         { "type": "codewhispererterminal_toolsPerMcpServer" }

crates/fig_telemetry_core/src/lib.rs

@@ -359,7 +359,6 @@ impl Event {
             } => Some(
                 CodewhispererterminalMcpServerInit {
                     create_time: self.created_time,
-                    credential_start_url: self.credential_start_url.map(Into::into),
                     value: None,
                     amazonq_conversation_id: Some(conversation_id.into()),
                     codewhispererterminal_mcp_server_init_failure_reason: init_failure_reason