fix(tier4_autoware_utils): fix covariance enum name

[scepter914]

Description

This PR change from pose_covariance_index::POSE_COV_IDX to xyzrpy_covariance_index::XYZRPY_COV_IDX.
This change of util library may make easy to read.

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[codecov]

Codecov Report

Base: 10.28% // Head: 10.17% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (d2d66d3) compared to base (f1aaa5d).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1950      +/-   ##
==========================================
- Coverage   10.28%   10.17%   -0.12%     
==========================================
  Files        1147     1148       +1     
  Lines       81963    83571    +1608     
  Branches    19035    20133    +1098     
==========================================
+ Hits         8433     8503      +70     
- Misses      64409    65766    +1357     
- Partials     9121     9302     +181     

Flag	Coverage Δ		*Carryforward flag
differential	11.55% <0.00%> (?)
total	10.27% <0.00%> (ø)		Carriedforward from 4c8c9b2

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...ted_object/src/radar_fusion_to_detected_object.cpp	0.00% <ø> (ø)
...onverter_node/radar_tracks_msgs_converter_node.cpp	0.00% <0.00%> (ø)
.../behavior_path_planner/src/turn_signal_decider.cpp	0.00% <0.00%> (ø)
...ehavior_path_planner/src/behavior_tree_manager.cpp	0.00% <0.00%> (ø)
...th_planner/src/scene_module/utils/path_shifter.cpp	0.00% <0.00%> (ø)
...anner/src/scene_module/pull_out/shift_pull_out.cpp	0.00% <0.00%> (ø)
...nner/src/scene_module/pull_out/pull_out_module.cpp	0.00% <0.00%> (ø)
...er/src/scene_module/avoidance/avoidance_module.cpp	0.00% <0.00%> (ø)
...er/src/scene_module/pull_over/pull_over_module.cpp	0.00% <0.00%> (ø)
...rc/scene_module/lane_change/lane_change_module.cpp	0.00% <0.00%> (ø)
... and 8 more

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[kenji-miyake]

Looks clean! Thanks.