fix: check lifecycle actions to avoid NPE when calling actions during scale-in

[leon-inf]

fix #8754

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.68%. Comparing base (fd21c31) to head (6be9263).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
controllers/apps/transformer_component_workload.go	60.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8762      +/-   ##
==========================================
+ Coverage   60.50%   60.68%   +0.17%     
==========================================
  Files         378      378              
  Lines       45955    45968      +13     
==========================================
+ Hits        27807    27896      +89     
+ Misses      15505    15433      -72     
+ Partials     2643     2639       -4     

Flag	Coverage Δ
unittests	60.68% <60.00%> (+0.17%)	⬆️

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[leon-inf]

/cherry-pick release-1.0-beta

[apecloud-bot]

🤖 says: cherry pick action finished successfully 🎉!
See: https://github.com/apecloud/kubeblocks/actions/runs/12701555970