feat: add ability to restart single service

[wakonig]

This PR refactors the tmux launch utils and adds the option to restart a single service, either through the cli or through BEC messages. This will enable us to restart single services through the GUI.

[codecov]

Codecov Report

❌ Patch coverage is 12.84404% with 190 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
..._server/bec_server/bec_server_utils/tmux_launch.py	13.48%	77 Missing ⚠️
...ver/bec_server/bec_server_utils/service_handler.py	27.27%	40 Missing ⚠️
.../bec_server/bec_server_utils/supervisor_service.py	0.00%	38 Missing ⚠️
...c_server/bec_server/bec_server_utils/cli/launch.py	0.00%	18 Missing ⚠️
bec_server/bec_server/bec_server_utils/launch.py	0.00%	17 Missing ⚠️

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[Copilot]

Pull Request Overview

This PR adds the ability to restart individual services in the BEC server infrastructure. Previously, only full server restarts were supported.

Key changes:

• Added service_name parameter to ServiceRequestMessage to specify which service to restart
• Implemented service-level start/stop/restart operations in the CLI service handler and tmux launcher
• Added --service command-line argument to start, stop, and restart commands

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
bec_lib/bec_lib/messages.py	Added optional service_name field to ServiceRequestMessage
bec_server/bec_server/scihub/service_handler/service_handler.py	Enhanced service handler to support single service restarts via message requests
bec_server/bec_server/bec_server_utils/service_handler.py	Added ServiceOperation enum and methods for starting, stopping, and restarting individual services
bec_server/bec_server/bec_server_utils/tmux_launch.py	Implemented tmux-specific functions for managing individual service panes
bec_server/bec_server/bec_server_utils/launch.py	Added --service argument to CLI commands and routing logic
bec_server/tests/tests_scihub/test_service_handler.py	Added comprehensive test coverage for service handler message processing
bec_server/tests/tests_bec_server_utils/test_cli_service_handler.py	Added tests for CLI service handler restart operations
bec_server/tests/tests_bec_server_utils/test_tmux_launch.py	Added tests for tmux service management functions
bec_server/tests/tests_bec_server_utils/test_main.py	Updated existing tests to include new service argument

Comments suppressed due to low confidence (1)

bec_server/bec_server/bec_server_utils/tmux_launch.py:1

• The assertion checks for '--service scan_server' as a substring in the command string, but the command is constructed as f'{self.command} restart --service {service_name}'. This creates a space-separated command where the substring check may fail if the command is split into a list or formatted differently. Consider checking for both '--service' and 'scan_server' separately, or verify the exact command construction pattern.

import os

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