Add clean env behaviour

[callmevladik]

Description:
This task focuses on enhancing the user interface of the clean-edp tool to offer a more intuitive and user-friendly experience during the resource deletion process. The aim is to simplify the current process, which may come across as complex or unclear, thereby reducing the risk of user errors and accidental deletions.

Acceptance Criteria:

Intuitive Step-by-Step Process: Design and implement a clear, step-by-step guided process for users, making the resource removal experience straightforward and easy to navigate.
Explicit Confirmation Steps: Integrate a detailed confirmation step that explicitly lists the resources slated for removal, requiring user verification to proceed. This is key to preventing unintended resource deletions.
Comprehensive Error Handling and Feedback: Ensure the tool provides clear, actionable feedback in the event of errors or issues during the deletion process, helping users understand what went wrong and how to fix it.

Implementation Plan:

Evaluate the current resource removal workflow within the clean-edp tool to identify areas for improvement.
Redesign the workflow to incorporate the specified acceptance criteria, with an emphasis on simplicity and user engagement.
Implement the redesigned workflow, focusing on error handling and providing clear feedback to users.
Conduct user testing to gather feedback, making adjustments as needed to refine the user experience.

AC:
UI:

Add field 'Clean pipeline template' in stage creation form;
to get all Clean pipeline template use label: 'app.edp.epam.com/pipelinetype: clean'
Rename 'Pipeline template' to 'Deploy pipeline template';
Add 'Clean pipeline template' to stage edit form;
Add 'Deploy pipeline template' and 'Clean pipeline template' field to stage overview;
Add 'Clean' button in stage page view;

DevOps:

enable 'clean' tekton pipeline, this pipeline should remove all ArgoCD application in current stage; use label: 'app.edp.epam.com/pipelinetype: clean' (argocd cli)
create 'clean' tekton pipeline template with label: 'app.edp.epam.com/pipelinetype: clean'
align current 'clean-edp' pipeline to this approach

Backend:

enable new field in stage CR: spec.cleanTemplate