[FR]: Exclude transitioned targets

### What is the current behavior?

If a library target is transitioned to a different target platform, the aspect will visit the library more than once.

For example,

```
cc_binary(a)
embedded_target(e1, apps = [a])
embedded_target(e2, apps = [a])
```

context: https://bazelbuild.slack.com/archives/CA31HN1T3/p1728485100416379?thread_ts=1728325365.388799&cid=CA31HN1T3

### Describe the feature

Some way to prevent propagating the aspect across transition boundaries is probably the desired fix.

Start by reproducing the cc_binary and two embedded_target example from the issue, then investigate the aspect's behavior across target-platform transition boundaries. Done means the library target is not visited more than once when shared by transitioned targets, with the intended propagation behavior established and verified.

Written by the indexing model from the issue text.