fix: unstable ci in create_and_edit_upstream_with_no_nodes.spec.js

[liuxiran]

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@liuxiran FE ci failed after this pr got merged. Could you please take a look, please refer to https://github.com/apache/apisix-dashboard/runs/2430236911. Thanks.

come from: #1812 (comment)

this pr tried to solve this unstable test case.

Related issues

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• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
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[codecov-commenter]

Codecov Report

Merging #1826 (907adfb) into master (2f3717f) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1826      +/-   ##
==========================================
+ Coverage   72.07%   72.14%   +0.06%     
==========================================
  Files         125      125              
  Lines        2944     2944              
  Branches      711      711              
==========================================
+ Hits         2122     2124       +2     
+ Misses        822      820       -2     

Flag	Coverage Δ
frontend-e2e-test	72.14% <ø> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
web/src/helpers.tsx	72.13% <0.00%> (+3.27%)	⬆️

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[imjoey]

/lgtm

Thank you @liuxiran.