chore: remove new cluster conn-credential API

[leon-inf]

No description provided.

[codecov]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (f1fa247) 68.42% compared to head (340ec0f) 68.55%.
Report is 13 commits behind head on main.

Files	Patch %	Lines
pkg/dataprotection/utils/utils.go	0.00%	12 Missing ⚠️
controllers/apps/transformer_cluster_credential.go	71.42%	4 Missing and 2 partials ⚠️
pkg/dataprotection/restore/manager.go	63.63%	3 Missing and 1 partial ⚠️
pkg/controller/component/vars.go	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6098      +/-   ##
==========================================
+ Coverage   68.42%   68.55%   +0.12%     
==========================================
  Files         295      295              
  Lines       33716    33619      -97     
==========================================
- Hits        23070    23046      -24     
+ Misses       8727     8647      -80     
- Partials     1919     1926       +7     

Flag	Coverage Δ
unittests	68.55% <54.54%> (+0.12%)	⬆️

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[nayutah]

This feature introduces API changes, which may incur compatibility problems, please make it clear in the manual books

[leon-inf]

/approve

[leon-inf]

/cherry-pick release-0.8

[github-actions]

🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/apecloud/kubeblocks/actions/runs/7248687009