Cover Submodule Actions with Tests

[martyanovandrey]

Problem:
Actions that are needed to keep the metapackage up to date must be stable and reliable as they form the backbone of multiple repositories' integration. Proper tests need to be in place to ensure their continued functionality.

Proposed solution:
Ensure that all actions are covered with appropriate tests to verify their functionality. This will include tests for the auto-bootstrap on submodule commits, submodule update action and package update action.