Automatic merge from submit-queue (batch tested with PRs 65719, 65764). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

juju: Fix upgrade actions not working with resources

**What this PR does / why we need it**:

This fixes an issue with the kubernetes-master and kubernetes-worker charms, where running the `upgrade` action does not actually perform an upgrade when snaps are attached as resources.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:

https://github.com/juju-solutions/bundle-canonical-kubernetes/issues/528

**Special notes for your reviewer**:

The underlying issue is that both layer-snap and the kubernetes layers are using `any_file_changed` to look for changes in the resources. This PR fixes it by removing the use of `any_file_changed` in the top-level layers, and implementing our own code for it instead.

**Release note**:

```release-note
NONE
```