[Enhance] Update issue form and management file

[fangyixiao18]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Base: 73.28% // Head: 73.28% // No change to project coverage 👍

Coverage data is based on head (ba5be96) compared to base (de6307e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #512   +/-   ##
=======================================
  Coverage   73.28%   73.28%           
=======================================
  Files         125      125           
  Lines        4994     4994           
  Branches      763      763           
=======================================
  Hits         3660     3660           
  Misses       1167     1167           
  Partials      167      167           

Flag	Coverage Δ
unittests	73.28% <ø> (ø)

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