Cancel pending invalidation lookup futures when `AnalysisCacheInvalidator.lookupKeysToInvalidate()` does not complete normally.

When `AnalysisCacheInvalidator.lookupKeysToInvalidate()` times out, encounters an `ExecutionException`, or is interrupted while submitting or waiting for responses, it falls back to invalidating all keys (`Futures.allAsList(futures).get(...)` only cancels the combined `ListFuture` wrapper on timeout/interruption, which does not propagate cancellation to the input futures unless they are explicitly cancelled). Leaving the individual lookup futures uncancelled keeps their `SkycacheChannelStateAdvisor` in-flight request tokens acquired and allows orphaned invalidation RPCs and buffered batch entries to remain active after the invalidation check has already given up.

Before:
```java
try {
  List<ListenableFuture<Optional<SkyKey>>> futures =
      submitInvalidationLookupsBatched(keysToLookup);
  ...
  keysToInvalidate =
      Futures.allAsList(futures).get(INVALIDATION_TIMEOUT_SECONDS, SECONDS).stream()
          .flatMap(Optional::stream)
          .collect(toImmutableSet());
  status = InvalidationLookupMetrics.Status.OK;
} catch (TimeoutException e) {
  status = InvalidationLookupMetrics.Status.TIMED_OUT;
  return keysToLookup;
} finally {
  stopwatch.stop();
  ...
}
```

After:
```java
List<ListenableFuture<Optional<SkyKey>>> futures = null;
try {
  futures = submitInvalidationLookupsBatched(keysToLookup);
  ...
} finally {
  if (futures != null && status != InvalidationLookupMetrics.Status.OK) {
    cancelFutures(futures);
  }
  stopwatch.stop();
  ...
}
```

Cancelling the submitted `ListenableFuture` instances in `finally` when `status != InvalidationLookupMetrics.Status.OK` (and when batch submission itself times out or is interrupted) propagates cancellation through `Futures.transform` / `Futures.transformAsync` to the underlying `analysisCacheClient.lookup()` futures immediately, releasing their in-flight request tokens.

PiperOrigin-RevId: 1007822773
Change-Id: I4fc0a25d576418fae428f16c0fb313ad643d8bd5