[Fix] enable CocoMetric to use bbox score in pred_instances

[Ben-Louis]

Motivation

Adjust the CocoMetric to utilize the predicted bounding box score as the instance score derived from pred_instances.bbox_scores.

Modification

1. Update CocoMetric to incorporate the predicted bounding box score as the instance score from pred_instances.bbox_scores.
2. Modify the testing configuration for yolox-pose and revise its accuracy.
3. Allow the inferencer to filter instances using predicted bounding box scores. Since the bounding box score threshold has been lowered to 0.001 from 0.2 in modification # 2, the model will yield low-quality instances. Therefore, a subsequent filtering step is required.

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Patch coverage: 48.38% and project coverage change: +0.02 🎉

Comparison is base (896e9d5) 82.25% compared to head (e3e10ea) 82.27%.

❗ Current head e3e10ea differs from pull request most recent head c09fc5f. Consider uploading reports for the commit c09fc5f to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2145      +/-   ##
===========================================
+ Coverage    82.25%   82.27%   +0.02%     
===========================================
  Files          228      228              
  Lines        13387    13393       +6     
  Branches      2268     2269       +1     
===========================================
+ Hits         11011    11019       +8     
+ Misses        1862     1855       -7     
- Partials       514      519       +5     

Flag	Coverage Δ
unittests	82.27% <48.38%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmpose/evaluation/metrics/coco_metric.py	95.00% <0.00%> (-0.96%)	⬇️
mmpose/apis/inferencers/pose2d_inferencer.py	70.58% <33.33%> (-2.22%)	⬇️
mmpose/visualization/local_visualizer.py	62.94% <51.92%> (+0.13%)	⬆️
mmpose/apis/inferencers/mmpose_inferencer.py	75.60% <100.00%> (+0.30%)	⬆️

... and 2 files with indirect coverage changes

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