Do not switch and remove node in one iteration

[joerg1985]

Description

Do not switch and remove node in one iteration of the nodes in purgeDeadNodes.

Motivation and Context

see #11948

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (83b0b0d) 54.87% compared to head (ac0fc1d) 54.87%.

❗ Current head ac0fc1d differs from pull request most recent head 5187579. Consider uploading reports for the commit 5187579 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #11961   +/-   ##
=======================================
  Coverage   54.87%   54.87%           
=======================================
  Files          86       86           
  Lines        5735     5735           
  Branches      233      233           
=======================================
  Hits         3147     3147           
  Misses       2355     2355           
  Partials      233      233           

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[diemol]

Thank you, @joerg1985!