Unify namespace/project wording in logs and Kogito CLI

Use namespace keyword in place of project keywording kogito-cli

Using project can confuse Kubernetes users as Kubernetes have only namespace.

In Scope :

Changes {}project p to -namespace -n flag

Note : This Jira is created to incorporate below refered review comment:

https://github.com/kiegroup/kogito-cloud-operator/pull/410#issuecomment-657976124