fix(ci): ensure samples directory is removed before cloning & rm useless sub git dir

[Alanxtl]

• ensure samples directory is removed before cloning
• rm useless sub git dir

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 15.99%. Comparing base (26606a8) to head (5a64140).
⚠️ Report is 70 commits behind head on develop.

❗ There is a different number of reports uploaded between BASE (26606a8) and HEAD (5a64140). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (26606a8)	HEAD (5a64140)
	1	0

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #775       +/-   ##
============================================
- Coverage    54.67%   15.99%   -38.68%     
============================================
  Files          671      220      -451     
  Lines        78658    16332    -62326     
============================================
- Hits         43006     2613    -40393     
+ Misses       31981    13483    -18498     
+ Partials      3671      236     -3435     

Flag	Coverage Δ
unittests	15.99% <ø> (?)

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[Copilot]

Pull Request Overview

This PR removes unused Git submodules and adds safety checks to ensure clean cloning operations in the CI workflow. The changes eliminate obsolete submodule references for actions-ding and review-dog while adding a directory cleanup step before cloning samples.

• Removed unused Git submodules for actions-ding and review-dog from .gitmodules
• Added directory cleanup logic before cloning samples in the CI workflow
• Cleaned up the actual submodule directory reference

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.gitmodules	Removed submodule entries for actions-ding and review-dog
.github/workflows/github-actions.yml	Added directory cleanup before samples cloning
.github/actions/actions-ding	Removed submodule commit reference

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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

[AlexStocks]

ci 失败，还需要看下

[Alanxtl]

ci 失败，还需要看下

这个pr就是用来修复这个ci失败的，现在ci有clone路径被占用的问题，导致ci一直过不了，这个pr加了一个路径检测

[baerwang]

ci 失败，还需要看下

这个pr就是用来修复这个ci失败的，现在ci有clone路径被占用的问题，导致ci一直过不了，这个pr加了一个路径检测

加了这个，为什么还有ci失败的？

[AlexStocks]

先合并看看