Pin pytest below 8.1.0 and fix warnings when creating entities with invalid categories

[sea-bass]

Somehow the recent release of pytest 8.1.1 changed things so that passing an exception to warnings.warn() yielded an error. Converting the exception to a string before passing it in seems to solve the issue.

In addition to that, seems like there are issues with ROS tests as shown here: https://github.com/ros2/launch/issues/765. Since the PR to fix it only went into rolling and it's being debated whether it will be backported, may as well just pin the pytest version for now

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
__init__.py	0	0	100%
core
__init__.py	9	0	100%
dynamics.py	43	0	100%
gazebo.py	136	8	94%	55, 124, 230, 244–248
hallway.py	73	10	86%	59, 61, 63, 96, 158, 196–199, 205
locations.py	126	21	83%	53, 55, 69, 84–85, 87, 98–99, 101–102, 119, 177, 192, 217, 227, 273, 284–285, 287–288, 312
objects.py	69	4	94%	78, 106, 137, 197
robot.py	214	58	72%	140–141, 203, 216, 263, 277–278, 282, 286, 292–293, 295–296, 313–314, 342, 344–345, 366–367, 370–373, 376–378, 403, 407–409, 411, 413–416, 429–431, 435, 437–439, 441, 444–445, 448, 470–471, 479, 484–489, 492, 505
room.py	48	1	97%	113
world.py	571	136	76%	146–147, 183–184, 188, 241–242, 244–245, 273–274, 325, 339–340, 342–343, 372–376, 378–380, 382–383, 386, 390–394, 397–399, 402–409, 440, 476–477, 480, 496, 538, 541, 563–567, 569–571, 574–575, 578–581, 583, 586, 588–590, 592–594, 596, 615, 625–629, 664–665, 668–671, 688–689, 695–696, 698–699, 701, 703–704, 706, 708–709, 719–720, 723, 725, 739, 741, 748, 795, 826–827, 846–847, 851–852, 887–888, 890, 907–908, 927–931, 943–946, 958–961, 986–987, 989, 1033–1034, 1166–1167
yaml_utils.py	106	11	89%	64, 68, 152–154, 158–159, 182–183, 207–208
gui
__init__.py	2	0	100%
main.py	152	29	80%	22, 24–26, 28, 49, 178–181, 188–191, 193, 196–202, 206–208, 212–213, 219, 230
world_canvas.py	226	52	76%	34–36, 110, 112, 114, 177, 181, 232–237, 243–244, 246–248, 253–254, 257, 260–262, 265, 270–271, 273, 300, 322–327, 330, 333–334, 349–351, 354, 371, 400, 418–419, 421–422, 464, 480, 487
manipulation
__init__.py	1	0	100%
grasping.py	236	61	74%	102, 110–112, 114–122, 124, 132, 462, 464–466, 470–472, 566–568, 571–575, 583, 586–588, 593–594, 600–604, 607–614, 617–619, 628, 630, 632–638
navigation
__init__.py	4	0	100%
a_star.py	78	10	87%	67–72, 74–76, 165
execution.py	34	4	88%	46–47, 49–50
occupancy_grid.py	139	14	89%	44–47, 49–53, 56, 192, 226, 234, 238
path_planner.py	26	6	76%	32, 35, 37, 41, 84, 89
planner_base.py	59	17	71%	29–35, 51, 57–59, 140–145
prm.py	72	56	22%	40–44, 46, 50–51, 54, 57–64, 66–67, 76–79, 85, 101–102, 104–109, 111–112, 115–118, 121–126, 135, 144, 154, 156, 158–159, 161, 174–178
rrt.py	172	7	95%	228, 353–354, 360–361, 363, 392
trajectory.py	50	0	100%
world_graph.py	70	3	95%	118, 121, 145
planning
__init__.py	3	0	100%
actions.py	66	43	34%	59–60, 62, 66–75, 77–80, 82–86, 88–91, 93–97, 99–100, 102–104, 150–151, 154–158
planning/pddlstream
__init__.py	0	0	100%
defaultmappings.py	9	0	100%
planner.py	40	8	80%	119–126
primitives.py	57	2	96%	68, 208
utils.py	85	3	96%	66, 99–100
utils
__init_\.py	0	0	100%
general.py	33	4	87%	23, 45, 51–52
knowledge.py	139	16	88%	90–91, 100, 135–138, 145, 149–150, 163, 178, 182, 224, 240, 295
motion.py	60	6	90%	56, 67–71
polygon.py	111	0	100%
pose.py	89	3	96%	79, 211, 227
search_graph.py	93	3	96%	241–243
TOTAL	3501	596	82%

Tests	Skipped	Failures	Errors	Time
163	0 :zzz:	0 :x:	0 :fire:	3m 40s :stopwatch: