[E2E Test] The minimum worker node count of workload cluster should be 2

[danfengliu]

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[codecov-commenter]

Codecov Report

Merging #6632 (c637057) into main (1777bbe) will decrease coverage by 0.02%.
Report is 19 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6632      +/-   ##
==========================================
- Coverage   60.17%   60.15%   -0.02%     
==========================================
  Files         242      242              
  Lines       25658    25711      +53     
==========================================
+ Hits        15439    15466      +27     
- Misses       9143     9163      +20     
- Partials     1076     1082       +6     

see 8 files with indirect coverage changes

[allenxu404]

LGTM