fix(liveslots): do not leak known resolved promises (#11119)

closes: #11118
refs: #10794

best reviewed commit-by-commit

## Description
Remove unreferenced vpids from know resolutions

### Security Considerations
None

### Scaling Considerations
None

### Documentation Considerations
None

### Testing Considerations
Verified manually using [mhofman/fu-impact](dc-fu-impact...mhofman/fu-impact).

Adds failing unit tests for the leak then marks the test as non failing in the fix commit

Adds a failing test for a remaining leak from #10756 not currently mitigated. It would likely be solved by #10778

### Upgrade Considerations
This will require a vat upgrade of all vats potentially resolving with known settled promises. We know of at least the smart wallet doing this, but others may also be affected. Since we cannot unilaterally upgrade vats yet (#8405), we'll have to look at which vats are impacted and include an explicit upgrade.

Author: mergify[bot]

packages/swingset-liveslots/src/liveslots.js

@@ -797,6 +797,7 @@ function build(
       for (const resolution of resolutions) {
         const [xvpid] = resolution;
         maybeNewVPIDs.delete(xvpid);
+        unregisterUnreferencedVPID(xvpid);
       }
     }
     for (const newVPID of Array.from(maybeNewVPIDs).sort()) {
@@ -1012,14 +1013,13 @@ function build(
       for (const resolution of resolutions) {
         const [xvpid] = resolution;
         maybeNewVPIDs.delete(xvpid);
+        unregisterUnreferencedVPID(xvpid);
       }
       // track everything that's left
       for (const newVPID of Array.from(maybeNewVPIDs).sort()) {
         maybeExportPromise(newVPID);
       }
 
-      // only the primary can possibly be newly resolved
-      unregisterUnreferencedVPID(vpid);
       exportedVPIDs.delete(vpid);
     }