Feature Overview
The Watcher service should allow to exclude actions from an Action Plan
execution in two situations:

• A cloud admin explicitly wants to exclude an action or set of actions from execution before starting an action plan.

• Watcher applier detects the object where the action is applied to be in a state where the action should not be applied. For example, in a migrate action,  the instance does not longer exist.

Goals
 
Currently Watcher does not provide a way to exclude actions execution when running an action plan. This has some issues that this feature is trying to solve:

• Administrators lack a standardized mechanism to preemptively skip actions that they don't want to execute when starting an action plan manually.
• Pre-condition failures are not clearly distinguished from execution failures.

This feature will improve both user experience and service robustness by avoiding action and action plan failures.{}

Done - Acceptance Criteria:

• Watcher API provides a method to skip an action from a pending action plan.
• Watcher automatically skips actions based on pre-condition checks.
• watcherclient and watcher-dashboard provide mechanism to skip actions manually by cloud admins.
• The new feature is covered by proper unit and tempest testing.