fix: fix for failure to trigger cd set on auto after pre-cd is success which is also on auto which got triggered after ci

[prakash100198]

Description

This pr handles the case when cd is set on auto and pre cd is also on auto, when ci completes then pre cd is triggered but cd is not triggered automatically, here handleCDStageCompleteEvent function was not placed correctly, this pr makes this func. independent of the check that terminal state of a workflow is reached or not also contains minor comments.

Fixes https://github.com/devtron-labs/sprint-tasks/issues/1879

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR requires documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested it for all user roles.
• I have added all the required unit/api test cases.

Does this PR introduce a user-facing change?

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud