fix: remove redundant @Waitable from callback_group_id

[atsushi421]

Description

This removes the redundant @Waitable from callback_group_id preserving backward compatibility.

Related links

How was this PR tested?

prerun

The redundant @Waitables are not outputed.

callback_groups:
  - id: /sample_node@Subscription(/parameter_events)@Service(/sample_node/get_parameters)@Service(/sample_node/get_parameter_types)@Service(/sample_node/set_parameters)@Service(/sample_node/set_parameters_atomically)@Service(/sample_node/describe_parameters)@Service(/sample_node/list_parameters)
    affinity: ~
    policy: SCHED_OTHER
    priority: 0

  - id: /sample_node@Subscription(/topic_in)
    affinity: ~
    policy: SCHED_OTHER
    priority: 0

run

Even if the old-version config is specified, the thread configurator works correctly.

$ ros2 run cie_thread_configurator thread_configurator_node --config-file template_old.yaml 
callback_groups:
  - id: /sample_node@Subscription(/parameter_events)@Service(/sample_node/get_parameters)@Service(/sample_node/get_parameter_types)@Service(/sample_node/set_parameters)@Service(/sample_node/set_parameters_atomically)@Service(/sample_node/describe_parameters)@Service(/sample_node/list_parameters)@Waitable@Waitable@Waitable@Waitable
    affinity: ~
    policy: SCHED_OTHER
    priority: 0
  - id: /sample_node@Subscription(/topic_in)@Waitable
    affinity: ~
    policy: SCHED_OTHER
    priority: 0
  - id: /sample_node@Timer(1333000000)
    affinity: ~
    policy: SCHED_OTHER
    priority: 0
  - id: /sample_node@Timer(3000000000)
    affinity: ~
    policy: SCHED_OTHER
    priority: 0
[INFO] [1761249572.556376986] [thread_configurator_node]: Received CallbackGroupInfo: tid=2553028 | /sample_node@Subscription(/parameter_events)@Service(/sample_node/get_parameters)@Service(/sample_node/get_parameter_types)@Service(/sample_node/set_parameters)@Service(/sample_node/set_parameters_atomically)@Service(/sample_node/describe_parameters)@Service(/sample_node/list_parameters)
[INFO] [1761249572.556554787] [thread_configurator_node]: Received CallbackGroupInfo: tid=2553030 | /sample_node@Timer(1333000000)
[INFO] [1761249572.556586398] [thread_configurator_node]: Received CallbackGroupInfo: tid=2553031 | /sample_node@Subscription(/topic_in)
[INFO] [1761249572.556606673] [thread_configurator_node]: Received CallbackGroupInfo: tid=2553029 | /sample_node@Timer(3000000000)

Notes for reviewers

[sykwer]

LGTM

@atsushi421
Could you please update this doc to conform to the changes in this PR? Of course, in another PR.