fix(swingset): log vat termination and upgrade better (#9535)

Vat termination now makes the kernel do a console.log like:

 `kernel terminating vat v6 (failure=true)`

Vat upgrade now announces the start of the upgrade process with:

 `attempting to upgrade vat v6 from incarnation 0 to source b1-..`

in addition to announcing the success or failure of the upgrade

 `vat v6 upgraded from incarnation 0 to 1 with source b1-..`
 or
 `WARNING: vat v6 failed to upgrade from incarnation 0 (startVat)`

packages/SwingSet/src/kernel/kernel.js

@@ -251,6 +251,7 @@ export default function buildKernel(
    * @param {SwingSetCapData} info
    */
   async function terminateVat(vatID, shouldReject, info) {
+    console.log(`kernel terminating vat ${vatID} (failure=${shouldReject})`);
     const vatKeeper = kernelKeeper.provideVatKeeper(vatID);
     const critical = vatKeeper.getOptions().critical;
     insistCapData(info);
@@ -819,6 +820,10 @@ export default function buildKernel(
     );
     const disconnectionCapData = kser(disconnectionObject);
 
+    console.log(
+      `attempting to upgrade vat ${vatID} from incarnation ${oldIncarnation} to source ${bundleID}`,
+    );
+
     /**
      * Terminate the vat and translate internal-delivery results into
      * abort-without-termination results for the upgrade delivery.