fix: resolve the positioning error issue when storing external images

[LIlGG]

What type of PR is this?

/kind bug
/area editor
/milestone 2.22.x

What this PR does / why we need it:

在复制并粘贴上传外链图片时，在点击转存后，目前会出现图片无法被正常转换为相对链接，并且在非第一行粘贴时，会导致错误的图片插入在第一行。

此 PR 对转存的逻辑进行了修复，在转存时获取了当前编辑器中对应节点的相对位置，确保替换链接时的位置正确性。

How to test it?

1. 复制一个外链图片。
2. 在编辑器中任意一个位置粘贴。
3. 点击确认转存。
4. 查看其地址是否变为了相对地址。

Which issue(s) this PR fixes:

Fixes #7912

Does this PR introduce a user-facing change?

解决编辑器粘贴转存外链图片时无法替换链接及错误插入的问题。

[f2c-ci-robot]

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[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 SonarQube Cloud

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commit: 82a2063

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.19%. Comparing base (42c374d) to head (82a2063).
⚠️ Report is 291 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7987      +/-   ##
============================================
+ Coverage     59.55%   61.19%   +1.63%     
- Complexity     3812     3933     +121     
============================================
  Files           677      689      +12     
  Lines         23248    23507     +259     
  Branches       1500     1522      +22     
============================================
+ Hits          13846    14385     +539     
+ Misses         8764     8395     -369     
- Partials        638      727      +89     

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