add containerSecurityContext to extraModules init containers

[pellmont]

• added containerSecurityContext to initContainers of extraModules (if desired)
• added volume mount for modules in initContainers in controller-statefulset
• show description of extraModules in helm documentation

What this PR does / why we need it:

Some environments need to have securityContext defined on each container (or initContainer in a pod), this PR enables to configure these also on the extraModules initContainers.

Also there is a small fix in controller-statefulset (the volume mount which is done extraModule init containers in controller-deployment was missing)

Contributes to #9016

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

added ci values for config scenrios and rendered them with helm template to see the effects.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.
• Added Release Notes.

Does my pull request need a release note?

Any user-visible or operator-visible change qualifies for a release note. This could be a:

• CLI change
• API change
• UI change
• configuration schema change
• behavioral change
• change in non-functional attributes such as efficiency or availability, availability of a new platform
• a warning about a deprecation
• fix of a previous Known Issue
• fix of a vulnerability (CVE)

No release notes are required for changes to the following:

• Tests
• Build infrastructure
• Fixes for unreleased bugs

For more tips on writing good release notes, check out the Release Notes Handbook

NONE

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: pellmont (2f8e655)

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[k8s-ci-robot]

Hi @pellmont. Thanks for your PR.

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[pellmont]

/assign @cpanato

[cpanato]

/lgtm

thanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, pellmont

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