fix(perception_online_evaluator): add metric_value not only stat (#7100)(#7118) (revert of revert)

[kosuke55]

this PR need to wait for driving log replayer

Reverts #7118

#7100

Description

Previously, only stat with max, mean, and min as keys could be handled in diagnostics, but this PR allows metric_value with a single value.
This is to allow only one value to be included in metrics such as object counts, since all stat values are the same, which is redundant.

• stat type

- level: "\0"
  name: predicted_path_deviation_variance_CAR_5.00
  message: ''
  hardware_id: ''
  values:
  - key: min
    value: '0.039821'
  - key: max
    value: '0.039821'
  - key: mean
    value: '0.039821'

• metric_value type

- level: "\0"
  name: interval_average_objects_count_UNKNOWN_r100.00_h10.00
  message: ''
  hardware_id: ''
  values:
  - key: metric_value
    value: '4.000000'

Tests performed

psim

Effects on system behavior

Not applicable.

Interface changes

no interface changes for autoware.

but the diagnostic key used for tools (driving_log_replayer etc) is chaged

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[codecov]

Codecov Report

Attention: Patch coverage is 64.51613% with 11 lines in your changes missing coverage. Please review.

Project coverage is 15.58%. Comparing base (e800d54) to head (a3efa8a).
Report is 24 commits behind head on main.

❗ Current head a3efa8a differs from pull request most recent head 10366f4

Please upload reports for the commit 10366f4 to get more accurate results.

Files	Patch %	Lines
...evaluator/src/perception_online_evaluator_node.cpp	66.66%	0 Missing and 6 partials ⚠️
...eption_online_evaluator/src/metrics_calculator.cpp	40.00%	0 Missing and 3 partials ⚠️
...tor/test/test_perception_online_evaluator_node.cpp	75.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7167      +/-   ##
==========================================
+ Coverage   14.87%   15.58%   +0.70%     
==========================================
  Files        1992     1979      -13     
  Lines      138800   137069    -1731     
  Branches    43714    44458     +744     
==========================================
+ Hits        20653    21361     +708     
+ Misses      95359    92351    -3008     
- Partials    22788    23357     +569     

Flag	Coverage Δ		*Carryforward flag
differential	50.58% <64.51%> (?)
total	15.57% <ø> (+0.69%)	⬆️	Carriedforward from be9a2b8

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

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[hayato-m126]

LGTM

I confirmed that the following two types of DianosticsStatus are produced by actually running the code.

This PR code works with tier4/driving_log_replayer#467