tests(e2e): Create ServiceAccount for Vault (backport #3571)

[mergify]

This is an automatic backport of pull request #3571 done by Mergify.

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[codecov-commenter]

Codecov Report

Merging #3870 (f909c4f) into release-v0.9 (e53260c) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           release-v0.9    #3870      +/-   ##
================================================
- Coverage         66.93%   66.92%   -0.02%     
================================================
  Files               169      169              
  Lines              9149     9149              
================================================
- Hits               6124     6123       -1     
- Misses             2992     2993       +1     
  Partials             33       33              

Flag	Coverage Δ
unittests	66.92% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
pkg/ticker/ticker.go	68.75% <0.00%> (-2.50%)	⬇️
pkg/endpoint/providers/kube/client.go	81.96% <0.00%> (-0.82%)	⬇️
pkg/kubernetes/announcement_handlers.go	78.37% <0.00%> (+5.40%)	⬆️

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