feat(jira): add status discovery tool

[komar3456]

Description

Add a read-only Jira tool for listing statuses from REST API v2, returning compact status and category details. The tool supports an optional case-insensitive status-name filter.

Changes

• Add jira_get_statuses backed by /rest/api/2/status.
• Add the jira_statuses toolset and update generated tool documentation.
• Preserve ENABLED_TOOLS as an explicit tool-name allowlist.

Testing

• Affected unit and schema tests (803 passed).
• Integration tests (8 passed, 15 real-data-only tests skipped).
• Jira Cloud status discovery e2e (1 passed).
• Jira Data Center status discovery e2e (1 passed).
• Generated tool documentation check.
• Ruff format/lint and mypy for changed Python files.

Checklist

• Code follows project style guidelines.
• Regression tests cover status retrieval, filtering, and MCP schema compatibility.
• Documentation is regenerated and current.