Add Jira report to Slack workflow template

[sandeepenugurthi]

Summary

• add a new workflow template workflow-templates/jira-report-to-slack.yml that queries Jira with JQL and posts a formatted report to Slack
• support both scheduled runs and manual runs with optional jql / max_results overrides
• document required repository variables and secrets in README.md
• add template metadata in workflow-templates/jira-report-to-slack.properties.json

Configuration

Set these repository variables:

• JIRA_BASE_URL
• JIRA_REPORT_JQL
• JIRA_REPORT_MAX_RESULTS (optional)

Set these repository secrets:

• JIRA_USER_EMAIL
• JIRA_API_TOKEN
• SLACK_WEBHOOK_URL

Testing

• validated YAML structure and script syntax by review in repo
• no live integration test run (requires Jira and Slack credentials)