fix: Set securityContext.runAsNonRoot for tuning initContainer

[maksym-iv]

Setting statefulset.podTemplate.spec.securityContext.runAsNonRoot: true (spec.template.spec.securityContext.runAsNonRoot: true in STS) will cause the STS pods to fail the startup with CreateContainerConfigError: Error: container's runAsUser breaks non-root policy... error .

Since RunAsUser is already hardcoded to 0 it seems to make sense to explicitly allow root with runAsNonRoot: false for the tuning initContainer

Fixes the #1162

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[RafalKorepta]

I opened new PR #1165. Thank you for your fix!

[maksym-iv-ef]

I opened new PR #1165. Thank you for your fix!

tyty, my bad, I should have read a bit more to helmette and testing approach with it
As an excude - was making PR in a rush 😅