TT-7028 Fix support for bool values

[zalbiraw]

Description

Currently if we try to set an extraEnv that is a bool variable the helm charts will fail...

failed to create resource: Deployment in version "v1" cannot be handled as a Deployment: json: cannot unmarshal bool into Go struct field EnvVar.spec.template.spec.containers.env.value of type string

Motivation and Context

Such sets will fail...
--set "mdcb.extraEnvs[0].name=TYK_MDCB_SYNCWORKER_ENABLED"
--set "mdcb.extraEnvs[0].value=true"
--set "mdcb.extraEnvs[1].name=TYK_MDCB_SYNCWORKER_HASHKEYS"
--set "mdcb.extraEnvs[1].value=true" \

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• Make sure you are requesting to pull a topic/feature/bugfix branch (right side). If PRing from your fork, don't come from your master!
• Make sure you are making a pull request against our master branch (left side). Also, it would be best if you started your change off our latest master.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.