Fixes https://github.com/gitpod-io/gitpod/issues/14509
Currently, Analytics in preview environments are broken through
werft as we need to pass the write key through attributes which
means we would leak it.
This PR fixes that by instead updating weft to read them from
a Kubernetes secret (This is already added into the cluster. See
https://github.com/gitpod-io/ops/pull/6614). This means users
now enable analytics by using setting `analytics: segment` and
we read `segment-staging-write-key` to make it work. This secret
is set to the staging segment source right now.
Signed-off-by: Tarun Pothulapati <tarun@gitpod.io>
