[Fix] copy metainfo in get_data_info

[Tau-J]

Motivation

Modification

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: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (2016609) 82.21% compared to head (0271376) 82.20%.

❗ Current head 0271376 differs from pull request most recent head d87c99b. Consider uploading reports for the commit d87c99b to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2017      +/-   ##
===========================================
- Coverage    82.21%   82.20%   -0.02%     
===========================================
  Files          220      220              
  Lines        13100    13103       +3     
  Branches      2228     2228              
===========================================
+ Hits         10770    10771       +1     
- Misses        1832     1836       +4     
+ Partials       498      496       -2     

Flag	Coverage Δ
unittests	82.20% <100.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
mmpose/datasets/dataset_wrappers.py	93.61% <100.00%> (ø)
.../datasets/datasets/base/base_coco_style_dataset.py	89.47% <100.00%> (+0.18%)	⬆️
mmpose/datasets/transforms/common_transforms.py	85.38% <0.00%> (-0.58%)	⬇️

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