ci: Refactor multi-charm repos to run integration and unit tests only upon sub-directory changes

[orfeas-k]

Context

Currently in multi-charm repositories (e.g. KFP), we run the CI for every charm on every PR. This doesn't make sense when there are no changes to a charm's directory. The integration between them should be tested by the repo's bundle tests.

What needs to get done

Refactor multi-charm repositories to run integration and unit tests for each charm only when there is a change in their corresponding directories.

Definition of Done

Specific charm tests are run only when something changes.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5864.

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