Fix: rollback delete resource logic

[chivalryq]

Rollback changes in: https://github.com/kubevela/terraform-controller/pull/332/files#diff-1aa78f86e236bbfbdd87a2dd01cfad0cda0964bdfc8ba4a7ba036fd11cbbabb5L350

Change the variable name, add some comments.

Signed-off-by: Qiaozp qiaozhongpei.qzp@alibaba-inc.com

[leason00]

LGTM

[codecov]

Codecov Report

Merging #341 (1f49401) into master (5d81c7b) will increase coverage by 2.72%.
The diff coverage is 80.51%.

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
+ Coverage   76.58%   79.31%   +2.72%     
==========================================
  Files          24       23       -1     
  Lines        1764     1750      -14     
==========================================
+ Hits         1351     1388      +37     
+ Misses        335      278      -57     
- Partials       78       84       +6     

Flag	Coverage Δ
e2e	?
unit	79.31% <80.51%> (-0.54%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
controllers/configuration/configuration.go	95.40% <ø> (+2.33%)	⬆️
controllers/configuration/backend/kubernetes.go	76.10% <72.72%> (-6.51%)	⬇️
controllers/configuration_controller.go	77.35% <82.95%> (-0.36%)	⬇️
controllers/configuration/backend/backend.go	89.58% <100.00%> (+0.22%)	⬆️
controllers/provider/credentials.go	92.63% <100.00%> (ø)
controllers/provider/ucloud.go	100.00% <100.00%> (ø)
controllers/terraform/status.go	77.41% <100.00%> (ø)
e2e/normal/regression.go

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