CH-55 CH-61 add retry policy and customization to tasks

[filippomc]

Closes CH-55 CH-61

Implemented solution

Added a parameter to operation tasks that allows us to set a retry policy (defaulted to 10 times), and another parameter that allows to override anything within the task template.

How to test this PR

Run a failing task and verify it retries 10 times

Sanity checks:

• The pull request is explicitly linked to the relevant issue(s)
• The issue is well described: clearly states the problem and the general proposed solution(s)
• In this PR it is explicitly stated how to test the current change
• The labels in the issue set the scope and the type of issue (bug, feature, etc.)
• The relevant components are indicated in the issue (if any)
• All the automated test checks are passing
• All the linked issues are included in one Sprint
• All the linked issues are in the Review state
• All the linked issues are assigned

Breaking changes (select one):

• The present changes do not change the preexisting api in any way
• This PR and the issue are tagged as a breaking-change and the migration procedure is well described above

Possible deployment updates issues (select one):

• There is no reason why deployments based on CloudHarness may break after the current update
• This PR and the issue are tagged as alert:deployment

Test coverage (select one):

• Tests for the relevant cases are included in this pr
• The changes included in this pr are out of the current test coverage scope

Documentation (select one):

• The documentation has been updated to match the current changes
• The changes included in this PR are out of the current documentation scope

Nice to have (if relevant):

• Screenshots of the changes
• Explanatory video/animated gif

[Copilot]

Pull Request Overview

This PR implements a retry policy and template customization for tasks in the workflows module. Key changes include:

• Adding new parameters (retry_limit and template_overrides) to tasks for retry behavior and customization
• Updating tests, documentation, and operations to use the new argo_service instead of the legacy argo module

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
libraries/cloudharness-common/tests/test_workflow.py	Updated tests to enforce the new retry limit and template overrides in custom tasks
libraries/cloudharness-common/tests/test_env.py	Minor clean-up in environment setup
libraries/cloudharness-common/tests/test_applications.py	Updated test environment configuration
libraries/cloudharness-common/cloudharness/workflows/tasks.py	Added retry_limit and template_overrides parameters; adjusted PythonTask to accept extra kwargs
libraries/cloudharness-common/cloudharness/workflows/operations.py	Replaced legacy argo module calls with argo_service
libraries/cloudharness-common/cloudharness/workflows/argo_service.py	Enhanced namespace handling with error fallback
libraries/cloudharness-common/cloudharness/utils/init.py	Updated dict_merge to optionally merge None values
docs/applications/development/workflows-api.md	Added documentation for the new retry strategy and free template customization
applications/workflows/server/workflows_api/service/workflow_service.py	Updated to use argo_service for workflow operations

[aranega]

It looks perfect! 🙏 Thanks @filippomc