add CI for pt1.8 pt1.9

[zhouzaida]

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Motivation

add ci for pt1.8 pt1.9

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 repos?
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

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[ZwwWayne]

Can be merged after merging master as #1146 is merged.

[codecov]

Codecov Report

Merging #1141 (71c53b5) into master (4a9f834) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1141   +/-   ##
=======================================
  Coverage   67.99%   67.99%           
=======================================
  Files         159      159           
  Lines       10426    10426           
  Branches     1897     1897           
=======================================
  Hits         7089     7089           
  Misses       2968     2968           
  Partials      369      369           

Flag	Coverage Δ
unittests	67.99% <ø> (ø)

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[zhouzaida]

Can be merged after merging master as #1146 is merged.

done @ZwwWayne