hack: redundant 'set -e' alongside 'set -o errexit' in shell scripts

[Ankitsinghsisodya]

Problem

hack/create-kind-cluster.sh (lines 17–18) and hack/install.sh (lines 19–20) both have:

set -e
set -o errexit

set -e is an exact alias for set -o errexit. Having both on consecutive lines creates misleading code that implies they do different things, and introduces unnecessary noise.

Proposed Fix

Remove the set -e line and keep only set -o errexit in both files.

[Ankitsinghsisodya]

/assign