Jira integration for release readiness

[gitstart-app]

Closes #646

Implementation

We implemented a Jira API layer integrated with Atlassian’s OAuth2, allowing secure access to Jira data. Users can select their Jira organization during setup and configure multiple projects with custom “done” states and release filters (labels or fix versions).

The JiraIntegration model manages API calls for fetching projects, workflows, and tickets. We added “Project Management” as a new integration category in Tramline, with Jira as the first platform. The functionality, including OAuth flow, project setup, and ticket fetching, is thoroughly tested with fixtures and unit tests.

Demo

https://www.loom.com/share/14b9a786dfa742d194f5f079d52b4766?sid=9554c7d6-414c-4f51-9caa-74004b473af1

[gitstart-tramline]

Hi @kitallis, PR is ready for review. Please review.

[gitstart-tramline]

Here are the steps to set up the Jira integration

To create an app for Jira integration and obtain the client_id and `client_secret, follow these steps:
Step 1: Create a Developer Account

• Visit the Atlassian Developer Portal .
• Sign in with your Atlassian account or create a new one.

Step 2: Create a New App

• Navigate to the Developer Console.
• Click on Create App and select the option for OAuth 2.0.
• Provide the following details:
  • App Name
  • App Description
  • API Permissions:
    • Required permissions: read:jira-work write:jira-work read:jira-user offline_access

Step 3: Set Redirect URLs

• In the Authorization section, add the Callback URL: https://tramline.local.gd:3000/jira/callback

Locate the client_id and client_secret in Settings.