Add LaunchConfigAsBool (Fixes #5233)

[nishalangovender]

Basic Info

Info	Please fill out this column
Ticket(s) this addresses	#5233
Primary OS tested on	Ubuntu Desktop 24.04 LTS
Robotic platform tested on	Gazebo Sim
Does this PR contain AI generated software?	Yes

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Description of contribution in a few bullet points

• Added LaunchConfigAsBool utility function to nav2_common.launch module for consistent boolean argument handling, specifically when used for compound conditional checks using PythonExpressions
• Updated nav2_bringup launch files to use the new utility instead of inconsistent boolean conditionals
• Enhanced robustness by supporting multiple boolean string representations (true/True/1/yes/on)

Description of documentation updates required from your changes

• No documentation updates required - this is an internal consistency fix

Description of how this change was tested

• Wrote a unit test that covers various boolean launch types
• Built and tested nav2_common and nav2_bringup packages successfully
• Verified launch file loads without errors with various boolean argument combinations
• Tested multiple boolean string formats: slam:=true, slam:=True, slam:=1, slam:=yes

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For Maintainers:

• Check that any new parameters added are updated in docs.nav2.org
• Check that any significant change is added to the migration guide
• Check that any new features OR changes to existing behaviors are reflected in the tuning guide
• Check that any new functions have Doxygen added
• Check that any new features have test coverage
• Check that any new plugins is added to the plugins page
• If BT Node, Additionally: add to BT's XML index of nodes for groot, BT package's readme table, and BT library lists
• Should this be backported to current distributions? If so, tag with backport-*.

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[SteveMacenski]

Please make sure to sanity check by exercising the things you set as launch configurations for bools to make sure specifying them on the commandline as true/True/false/False render OK for their logic (since some are used in PythonExpressions that won't be exercised unless set or launch arguments that if not using the default values may also expose issues)

[nishalangovender]

Yes, that makes sense. I manually tested these using the turtlebot launch files in nav2_bringup as my test file runs a unit test. I'm not sure if I understand this correctly, but would you prefer an integration-level test (i.e. cli tests like ros2 launch nav2_bringup tb3_simulation.launch.py use_rviz:=true headless:=false) over a unit test + manual tests?

[SteveMacenski]

@nishalangovender the manual testing is OK for this one. Last review comment and then we can merge this :-) Thanks for the follow up!

[SteveMacenski]

Thanks @nishalangovender ! Merged :-)