fix: wrong registry creds is used in CD stage (PRE/POST)

[Ash-exp]

Description

Wrong registry credential is supplied to CD stage (Pre-CD/ Post-CD). This PR will fix that issue.
Pre/ Post CD Registry Credentials:

• CI Build :
  It will use the overridden credentials (if any) OR the base application level credentials.

• Link CI :
  It will fetch the parent CI pipeline first.
  Then will use the CI Build overridden credentials (if any) OR the Source application (App that contains CI Build) level credentials.

• Sync CD :
  It will fetch the parent CD pipeline first.

• CASE CD Pipeline has CI Build as artifact provider :
  Then will use the CI Build overridden credentials (if any) OR the Source application (App that contains CI Build) level credentials.

• CASE CD Pipeline has Link CI as artifact provider :
  It will fetch the parent CI pipeline of the Link CI first.
  Then will use the CI Build overridden credentials (if any) OR the Source application (App that contains CI Build) level credentials.

• Skopeo Plugin :
  If any artifact has information about :
  credentials_source_type(global_container_registry) credentials_source_value(registry_id)
  Then we will use the credentials_source_value to derive the credentials.

• Polling plugin :
  If the ci_pipeline_type type is CI_JOB
  We will always fetch the registry credentials from the ci_template_override table

Fixes #4665

How Has This Been Tested?

• CI Build
• Linked CI
• Linked CD
• Webhook
• CI Job
• Skopeo plugin
• Devtron Jobs

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?

[sonarcloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud