enh: use flags to enabled/disable additional functionalities instead of using examples folder

[mglotov]

PR Description

• Сhanged the way of using additional functionalities. Moved all of them in layer root folders and added a flag (count) to have the possibility to enable/disable them instead of having the examples folders
• Introduced new k8s storageclass (advanced) and switched PVC to use it
• Disabled metricbeat and apm server in default ELK installation. Deleted OAuth configuration for Kibana
• Set resources:requests and limits for pilot (istio component)
• Pinned security_group terraform module in modules/aws-ec2-pritunl and fixed issues with variables
• Fixed networkpolicy for kube-prometheus-stack-operator (there was a problem with admission-webhook)
• Restrict IAM permissions for Teamcity IAM policy

Fixes #172
Fixes #178
Fixes #179
Fixes #180
Fixes #181
Fixes #182
Fixes #183

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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