Added securityContext option to each container's template

[majermarci]

Due to our CaaS security policies these must be set, so I added then in the templates.
Each container has it's designated section already in values for the containerSecurityContext, therefore I uncommented those with empty values as well.

[teichmat]

Regarding CaaS, the folder "platforms" was intended for cloud or kubernetes-version specific defaults.
However, there is nothing wrong with creating the security context settings in any k8s.

[majermarci]

If you need I can add a new general values file for CaaS in platforms directory as well.
The main focus here is the addition in templates, as they were missing, so no values file could have set securityContext.

[NLelekova]

All good, just update the formatting, please :)

[NLelekova]

Please, remove the empty lines

[majermarci]

I can remove them sure, just left them there for readability, as security context is not related to either the image nor the resources.

[NLelekova]

Thank you for your contribution!