(integ-runner): `integ-runner` ignores stack list arg for destroy

Today, someone can write this:
```
integ = new IntegTest(appContext.cdkApp, `IntegTest`, {
testCases: [stack, otherStack],
assertionStack: testStack,
enableLookups: true,
stackUpdateWorkflow: false,
cdkCommandOptions: {
destroy: {
stacks: [otherStack.node.id], // this is ignored
},
},
});
```
However the `stacks` argument get's ignored as the implementation is always forcing `--all` on the run.

We should either:
- fix the bug
- document the inconsistency (not preferred), or
- remove the option completely.

---

Haven't thought about this a lot, but from an `integ-runner` product perspective I don't like these options. It makes the tool to generic. If this specificity is needed, someone can just use the Toolkit (CLI or library) directly. So I'm inclined to remove support for most options and only keep some that make sense.