Fix entity type values in sim tools and docs (backport #927)

[mergify]

🦟 Bug fix

Summary

Fix the entity type values used by the delete_entity and set_entity_pose tools and the ros_gz_sim_demos documentation so they match ros_gz_interfaces/msg/Entity.msg.

The previous CLI help text and README table were inconsistent with the entity type constants defined in ros_gz_interfaces/msg/Entity.msg. This could cause users to pass the wrong entity type value when using --type.

ros_gz/ros_gz_sim_demos/README.md

Lines 330 to 342 in 0ea9efc

	### Entity Type Reference
	When using the `set_entity_pose` and `delete_entity` commands, you can specify the entity type using the `--type` flag. The following type values are available:
	| Value | Entity Type |
	|-------|-------------|
	| 0 | NONE |
	| 1 | LIGHT |
	| 2 | LINK |
	| 3 | VISUAL |
	| 4 | COLLISION |
	| 5 | SENSOR |
	| 6 | MODEL (default) |

ros_gz/ros_gz_sim/src/delete_entity.cpp

Lines 121 to 124 in 0ea9efc

	int entity_type = 6; // Default to MODEL type
	app.add_option("--type", entity_type,
	"Entity type: 0=NONE, 1=LIGHT, 2=LINK, 3=VISUAL, 4=COLLISION, "
	"5=SENSOR, 6=MODEL(default)");

ros_gz/ros_gz_sim/src/set_entity_pose.cpp

Lines 167 to 170 in 0ea9efc

	int entity_type = 6; // Default to MODEL type
	app.add_option("--type", entity_type,
	"Entity type: 0=NONE, 1=LIGHT, 2=LINK, 3=VISUAL, 4=COLLISION, "
	"5=SENSOR, 6=MODEL(default)");

ros_gz/ros_gz_interfaces/msg/Entity.msg

Lines 1 to 9 in 0ea9efc

	# Entity type: constant definition
	uint8 NONE = 0
	uint8 LIGHT = 1
	uint8 MODEL = 2
	uint8 LINK = 3
	uint8 VISUAL = 4
	uint8 COLLISION = 5
	uint8 SENSOR = 6
	uint8 JOINT = 7

Backport Policy

• This is safe to backport to the following versions:
  • Jetty
  • Ionic
  • Harmonic
  • Fortress
• This should not be backported
• I am not sure
• Other (fill in yourself)

Checklist

• Signed all commits for DCO
• Added a screen capture or video to the PR description that demonstrates the fix (as needed)
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• Updated Bazel files (if adding new files). Created an issue otherwise.
• While waiting for a review on your PR, please help review another open pull request to support the maintainers
• Was GenAI used to generate this PR? If so, make sure to add "Assisted-by" to your commits. (See this policy for more info.)

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This is an automatic backport of pull request #927 done by [Mergify](https://mergify.com).