fix: code block content insertion location error

[LIlGG]

What type of PR is this?

/kind bug
/area editor
/milestone 2.15.x

What this PR does / why we need it:

在编写多行文本后，粘贴代码块时，会出现粘贴的内容插入错误，其与代码块分割开。

2024-04-10.140202_out.mp4

在本 PR 中，在创建 CodeBlock 时，将 Text 转为 TextNode 后，一同传入作为 CodeBlock 的 content。
另外为了保证插入代码块之后，光标处于代码块中，将会从插入位置的 from 开始往文档顶部搜索。

How to test it?

测试示例中的场景下，代码块插入是否正常。

测试在代码块前后放入其他代码块或者其他块，插入代码块后光标是否在代码块中。

Which issue(s) this PR fixes:

Fixes #5736

Does this PR introduce a user-facing change?

修复默认编辑器中粘贴代码块会出现错行的问题

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.3% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.48%. Comparing base (5fdf6c0) to head (b9a361b).
Report is 114 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5737      +/-   ##
============================================
- Coverage     56.91%   56.48%   -0.44%     
- Complexity     3319     3333      +14     
============================================
  Files           587      598      +11     
  Lines         18968    19334     +366     
  Branches       1401     1359      -42     
============================================
+ Hits          10795    10920     +125     
- Misses         7594     7849     +255     
+ Partials        579      565      -14     

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[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

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• ui/OWNERS [ruibaby]

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[ruibaby]

/cherry-pick release-2.14

[halo-dev-bot]

@ruibaby: new pull request created: #5773

In response to this:

/cherry-pick release-2.14

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