Added behaviour_tree as input to action nodes

[tonynajjar]

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Basic Info

Info	Please fill out this column
Ticket(s) this addresses	#1784 (comment)
Primary OS tested on	Ubuntu
Robotic platform tested on	Own gazebo simulation

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Description of contribution in a few bullet points

The NavigateToPose Action server accepts a behavior tree as input but its corresponding BT action node does not have a behavior_tree option. I added the behavior_tree option

Description of documentation updates required from your changes

• Added new parameter, so need to add that to default configs and documentation page

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Future work that may be required in bullet points

For Maintainers:

• Check that any new parameters added are updated in navigation.ros.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

[mergify]

@tonynajjar, please properly fill in PR template in the future. @SteveMacenski, use this instead.

• Check that any new parameters added are updated in navigation.ros.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

[SteveMacenski]

Thanks!