fix: ci pipeline deletion bug fix

[kartik-579]

Description

Ci pipeline deletion throws error that cd pipeline exists when there a cd pipeline with id = ciPipelineId and has a children cd. This makes the check of having children pass even when there is none. Updated the query to check children of ci pipeline independent of other pipelines.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR require 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