fix: Fix the style of the parent header in the fixed part sub-level c…

[biubiukam]

Fix the style of the parent header in the fixed part sub-level column scenario under the multi-level header, and adjust the corresponding unit test cases.

fix https://github.com/ant-design/ant-design/issues/44974

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Name	Status	Preview	Comments	Updated (UTC)
table	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 27, 2023 0:49am

[lzl0304]

This seems to cause bug #39880 to be reopened.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (35aa2d5) 99.51% compared to head (441caa4) 99.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1028   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files          47       47           
  Lines        4517     4538   +21     
  Branches      571      578    +7     
=======================================
+ Hits         4495     4516   +21     
  Misses         22       22           

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[biubiukam]

This seems to cause bug #39880 to be reopened.

I readjusted it once and restored the unit example test.

[yoyo837]

Please add some unit test case for it.