Remove installation ID generation for anonymous analytics

[pkosiec]

Description

Changes proposed in this pull request:

• Remove installation ID generation for anonymous analytics

We don't need that actually, we'll use kube-system UID as the anonymous ID.

Testing

 export ANALYTICS_API_KEY=""
go build -ldflags="-X github.com/kubeshop/botkube/internal/analytics.APIKey=${ANALYTICS_API_KEY}" -o ./botkube ./cmd/botkube/main.go
# command-line-arguments
export BOTKUBE_SETTINGS_LOG_LEVEL=info
export BOTKUBE_SETTINGS_KUBECONFIG=/Users/$USER/.kube/config
export BOTKUBE_CONFIG_PATHS="$(pwd)/resource_config.yaml,$(pwd)/comm_config.yaml"
./botkube

See the Identify event inside Segment debugger (contact me to have access).

Related issue(s)

Resolves #753
Resolves #729

[mszostok]

From the code point of view, LGTM 👍
I will ping you about e2e tests later today 👍