fix(arborist): drop orphaned patch entry on uninstall instead of EPATCHUNUSED (#9574)

`npm uninstall <pkg>` failed with `EPATCHUNUSED` when the package had a
registered patch, because uninstall left the now-orphaned
`patchedDependencies` entry in `package.json`.
This also wedged the project: every subsequent `npm install` failed the
same way until the user manually ran `npm patch rm`.

`resolvePatchedDependencies` now receives the `rm` list from
`buildIdealTree` and drops an unused selector whose package is being
removed, and `reify` persists that removal to `package.json`.
Selectors unused for any other reason still throw `EPATCHUNUSED`, and a
package that survives as a transitive dependency keeps its patch.

## References

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Fixes #9572