SecurityContext settings for executor container not fully honoured

[vatine]

Checklist:

• I've included the version.
• I've included reproduction steps.
• I've included the workflow YAML.
• I've included the logs.

What happened:

Nothing

What you expected to happen:

The configured security context to be applied to the wait pod.

How to reproduce it (as minimally and precisely as possible):

Configure the workflow-controller as:

executor:
  securityContext:
    runAsUser: 1000

Start any workflow, inspect the wait container (with, say, kubelet get pod ... -o yaml).

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