fix: list items require multiple backspace presses to delete

[LIlGG]

What type of PR is this?

/kind bug
/area editor
/milestone 2.18.x

What this PR does / why we need it:

目前当编辑器中列表内容为空时，需要按退格键多次才能删除掉此列表内容。

本 PR 在执行单行删除逻辑之前，会检查列表是否处于活动状态，如果是则不再执行单行删除的逻辑。列表会执行 ListKeyMap 相关快捷键。

How to test it?

1. 在默认富文本键入一个列表。
2. 使用退格键删除这个列表。
3. 查看是否可以一次就删除。

Which issue(s) this PR fixes:

Fixes #6389

Does this PR introduce a user-facing change?

修复默认编辑器中列表项需要按多次退格键才可以删除的问题

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.32%. Comparing base (bc10336) to head (7a47685).
Report is 92 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6408      +/-   ##
============================================
+ Coverage     54.51%   58.32%   +3.81%     
- Complexity     3523     3766     +243     
============================================
  Files           646      646              
  Lines         21862    21989     +127     
  Branches       1528     1546      +18     
============================================
+ Hits          11917    12826     +909     
+ Misses         9328     8540     -788     
- Partials        617      623       +6     

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[guqing]

/lgtm

[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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• ui/OWNERS [JohnNiang]

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[JohnNiang]

/cherrypick release-2.17

[halo-dev-bot]

@JohnNiang: new pull request created: #6410

In response to this:

/cherrypick release-2.17

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