fix: solve the problem that highlighting will prevent the keys

[LIlGG]

What type of PR is this?

/kind bug
/area editor
/milestone 2.18.x

What this PR does / why we need it:

此 PR 解决了使用高亮插件之后按 up 或 down 按键被阻止的问题。

此问题的来源为 halo-sigs/richtext-editor#56 ，在此前的 PR 中为了解决设置字体大小后再次设置高亮，会导致高亮无法完全笼罩字体的问题。

但经过仔细排查，发现上述问题之前的解决方式有误，正确的原因应该是设置字体大小的 span 标签与设置高亮的 mark 标签顺序相反导致。如下所示：

正确的情况应该是在 span 中包裹 mark。此 PR 提升了 TextStyle 的优先级，结果如下所示：

How to test it?

测试对文本使用高亮功能之后按 up 或 down 按键是否生效。
测试对在文本设置大小之后，使用高亮、删除线等样式是否正确。

Which issue(s) this PR fixes:

Fixes #6381

Does this PR introduce a user-facing change?

解决默认编辑器中对文本使用高亮会导致按键被阻止的问题

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.34%. Comparing base (bc10336) to head (0554d2d).
Report is 93 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6387      +/-   ##
============================================
+ Coverage     54.51%   58.34%   +3.83%     
- Complexity     3523     3766     +243     
============================================
  Files           646      646              
  Lines         21862    21989     +127     
  Branches       1528     1546      +18     
============================================
+ Hits          11917    12829     +912     
+ Misses         9328     8538     -790     
- Partials        617      622       +5     

☔ View full report in Codecov by Sentry.
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[LIlGG]

发现移除自定义样式后，同时也能解决 #6386 的问题

Fix #6386

[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

[ruibaby]

/lgtm

[guqing]

/lgtm

[JohnNiang]

/approve

[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: #6409

In response to this:

/cherrypick release-2.17

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