feat(autoware_behavior_path_planner): remove max_module_size param

[kyoichi-sugahara]

Description

I understand that max_module_size was introduced as a parameter based on the assumption that a scene module might need to be launched multiple times simultaneously.
However, currently there are no such use cases in reality.

The unnecessary existence of common parameters for scene modules could become a barrier when creating new scene modules. Therefore, I propose to remove it in this PR.

In this PR, I'm implementing a function that determines it's impossible to register a module if a scene module with the same name is already registered.

  /**
   * Determine if a new module can be launched. It ensures that only one instance of a particular
   * scene module type is registered at a time.
   *
   * When this returns true:
   * - A new instance of the scene module can be launched.
   * - No other instance of the same name of scene module is currently active or registered.
   *
   */
  bool canLaunchNewModule() const { return observers_.empty(); }

Related links

⚠️ Please approve this PR at first.

• feat(behavior_path_planner): remove max_module_size param autoware_launch#1045

How was this PR tested?

• run psim
• PASS TIERIV INTERNAL SCENARIOS

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.33%. Comparing base (3d849e9) to head (1c73e93).
Report is 572 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7764      +/-   ##
==========================================
- Coverage   15.09%   13.33%   -1.76%     
==========================================
  Files        1967      525    -1442     
  Lines      135941    49076   -86865     
  Branches    42122    11916   -30206     
==========================================
- Hits        20520     6546   -13974     
+ Misses      92700    41574   -51126     
+ Partials    22721      956   -21765     

Flag	Coverage Δ
differential	13.33% <ø> (?)
total	?

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