Set the status on different exceptions that are raised

[kimwnasptd]

Closes #25

Right now the Charm will go in a blocked status, but a lot of times it won't have a helpful error message. This PR improves the error handling to also set a status, but not when an action is triggered.

Changes

1. Update the non-action handlers that call _sync_profiles() to set the status of the charm
2. Update _sync_profiles() to raise ErrorWithStatus on API errors

Review Notes

Here's a following sequence of commands I tried and the corresponding charm statuses. In all cases shown the charm was in Blocked state.

juju deploy \
	./github-profiles-automator_amd64.charm \
	--resource \
	git-sync-image=registry.k8s.io/git-sync/git-sync:v4.4.0
# Config `repository` cannot be empty.

juju config \
	github-profiles-automator \
	repository=https://github.com/canonical/github-profiles-automator.git
#  Could not load YAML file at path pmr.yaml. You may need to configure `pmr-yaml-path`. Check the logs for more informa...

juju config \
	github-profiles-automator \
	pmr-yaml-path=tests/samples/pmr-sample-full.yaml
# Charm is missing required permissions. Make sure it has --trust.

juju config \
	github-profiles-automator \
	git-revision=incorrect-branch
# [git-sync-pebble-service] git-sync could not connect to the repository. You may need to configure the charm or add an...

juju config \
	github-profiles-automator \
	git-revision=main
# Charm is missing required permissions. Make sure it has --trust.

juju trust --scope=cluster github-profiles-automator
# Becase active

[mvlassis]

Minor comments, nice work!

[mvlassis]

Nice stuff :)