fix(docs): Update getting-started script pre-25.7.0

[NickLarsenNZ]

Increase the timeout to 30 minutes for the superset-load-examples Job.
It can take up to 18 minutes (depending on external factors)

Check and Update Getting Started Script

Part of stackabletech/issues#742

Note

During a Stackable release we need to check (and optionally update) the
getting-started scripts to ensure they still work after product and operator
updates.

# Some of the scripts are in a code/ subdirectory
# pushd docs/modules/superset/examples/getting_started
# pushd docs/modules/superset/examples/getting_started/code
pushd $(fd -td getting_started | grep examples); cd code 2>/dev/null || true

# Make a fresh cluster (~12 seconds)
kind delete cluster && kind create cluster
./getting_started.sh stackablectl

# Make a fresh cluster (~12 seconds)
kind delete cluster && kind create cluster
./getting_started.sh helm

popd

[razvan]

didn't test but I guess it can't hurt