fix: modify the ginkgo.By name of pvc deletion protection e2e

[kevin1689-cloud]

Ⅰ. Describe what this PR does

In the e2e of pvc deletion protection, I notice there is a "ginkgo.By" name at here sholud be changed.
The operation at here is to delete the PVC itself, which is not "Delete the PV bounded to PVC".

Ⅱ. Does this pull request fix one issue?

None.

Ⅲ. Describe how to verify it

None.

Ⅳ. Special notes for reviews

None.

[codecov-commenter]

Codecov Report

Merging #1304 (2a848e3) into master (b7977a7) will increase coverage by 0.06%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #1304      +/-   ##
==========================================
+ Coverage   48.59%   48.65%   +0.06%     
==========================================
  Files         151      151              
  Lines       21042    21042              
==========================================
+ Hits        10225    10239      +14     
+ Misses       9700     9690      -10     
+ Partials     1117     1113       -4     

Flag	Coverage Δ
unittests	48.65% <ø> (+0.06%)	⬆️

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see 3 files with indirect coverage changes

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[furykerry]

/lgtm

[furykerry]

/approve

[kruise-bot]

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