e2e,dsa,iaa: remove unnecessary layer ginkgo.Describe

[hj-johannes-lee]

Because of the indentation of code, it seems a bit dirty, but the only change is that the outermost layer
ginkgo.Describe("Without using operator", func() {}) is removed.

[codecov-commenter]

Codecov Report

Merging #1489 (ac14321) into main (6861ef5) will not change coverage.
The diff coverage is n/a.

❗ Current head ac14321 differs from pull request most recent head 766b25f. Consider uploading reports for the commit 766b25f to get more accurate results

@@           Coverage Diff           @@
##             main    #1489   +/-   ##
=======================================
  Coverage   50.04%   50.04%           
=======================================
  Files          43       43           
  Lines        4884     4884           
=======================================
  Hits         2444     2444           
  Misses       2301     2301           
  Partials      139      139           

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