Lower concurrent vsphere e2e run count

[cxbrowne1207]

Issue #, if available:

Description of changes:

Testing (if applicable):

Documentation added/planned (if applicable):

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[rahulbabu95]

/lgtm
/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rahulbabu95

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[cxbrowne1207]

/cherry-pick release-0-20

[eks-distro-pr-bot]

@cxbrowne1207: once the present PR merges, I will cherry-pick it on top of release-0-20 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0-20

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.48%. Comparing base (7a21189) to head (5a8843b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8380   +/-   ##
=======================================
  Coverage   73.48%   73.48%           
=======================================
  Files         578      578           
  Lines       36489    36489           
=======================================
  Hits        26814    26814           
  Misses       7956     7956           
  Partials     1719     1719           

☔ View full report in Codecov by Sentry.
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[eks-distro-pr-bot]

@cxbrowne1207: cannot checkout release-0-20: error checking out release-0-20: exit status 1. output: error: pathspec 'release-0-20' did not match any file(s) known to git

In response to this:

/cherry-pick release-0-20

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[rahulbabu95]

/cherrypick release-0.20

[eks-distro-pr-bot]

@rahulbabu95: new pull request created: #8382

In response to this:

/cherrypick release-0.20

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sp1999]

/cherry-pick release-0.19

[eks-distro-pr-bot]

@sp1999: new pull request created: #8504

In response to this:

/cherry-pick release-0.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.