feat(integrations): add group integration API endpoints for Jira

Harsh Rairequested to merge
gitlab-community/gitlab-org/api/client-go:harsh/group-jira-endpoints into main

Adds support for Jira group integration API endpoints and aligns integrations.go with the ongoing generic request pattern to reduce boilerplate.

Issue: #2171

  • Added endpoints according to API docs:
    • Set up Jira: SetUpGroupJira
    • Disable Jira: DisableGroupJira
    • Get Jira settings: GetGroupJiraSettings
  • Refactored existing integration endpoints (Harbor, Microsoft Teams) to the generic do[T] helper.

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