fix: kurtosis install script

There are two problems here:

1. On Ubuntu, the "command -v kurtosis &> /dev/null" fails to
detect if kurtosis is installed resulting in it trying to install
it again.

2. When extracting the kurtosis.tar.gz artifact it generates a
kurtosis binary in current folder. However we already have a
kurtosis/ folder in our repo so the extraction fails.

This commit fixes 1) so it works on any platform and addresses 2)
by removing the kurtosis automatic installation which should be
fine since its already a prerequisite in our kurtosis/README.md.

kurtosis/Makefile

@@ -4,34 +4,11 @@
 ###                                Kurtosis                                 ###
 ###############################################################################
 
-# Installs Kurtosis if not already installed
-install-kurtosis:
-	@echo "Checking for Kurtosis installation..."
-	@if ! command -v kurtosis &> /dev/null; then \
-		echo "Kurtosis could not be found, installing..."; \
-		OS=$$(uname -s | tr A-Z a-z); \
-		if [ "$$OS" = "darwin" ]; then \
-			brew install kurtosis-tech/tap/kurtosis-cli; \
-		elif [ "$$OS" = "linux" ]; then \
-			ARCH=$$(uname -m); \
-			if [ "$$ARCH" = "x86_64" ]; then ARCH="amd64"; \
-			elif [ "$$ARCH" = "arm64" ]; then ARCH="arm64"; \
-			else echo "Unsupported architecture $$ARCH for Kurtosis installation" && exit 1; fi; \
-			TAG=`curl -s "https://api.github.com/repos/kurtosis-tech/kurtosis-cli-release-artifacts/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/'`; \
-			curl -Lo kurtosis.tar.gz "https://github.com/kurtosis-tech/kurtosis-cli-release-artifacts/releases/download/$TAG/kurtosis-cli_${TAG}_${OS}_${ARCH}.tar.gz"; \
-			tar -xzf kurtosis.tar.gz; \
-			rm kurtosis.tar.gz; \
-			chmod +x kurtosis; \
-			sudo mv kurtosis /usr/local/bin/; \
-		else \
-			echo "Unsupported OS $$OS for Kurtosis installation" && exit 1; \
-		fi; \
-	else \
-		echo "Kurtosis is already installed"; \
-	fi
+verify-kurtosis-installed:
+	@command -v "kurtosis" > /dev/null || (echo "Please install Kurtosis, see kurtosis/README.md for instructions" && exit 1)
 
 # Starts a Kurtosis enclave containing a local devnet.
-start-devnet: install-kurtosis
+start-devnet: verify-kurtosis-installed
 	$(MAKE) build-docker VERSION=kurtosis-local start-devnet-no-build
 
 # Starts a Kurtosis enclave containing a local devnet without building the image
@@ -40,7 +17,7 @@ start-devnet-no-build:
 		--enclave my-local-devnet --parallelism 200
 
 # Starts a Kurtosis enclave containing a local devnet on GCP.
-# --production flag is used to indicate that the enclave is 
+# --production flag is used to indicate that the enclave is
 # running in production mode to allow pod restarts when doing chaos testing.
 start-gcp-devnet-no-build:
 	kurtosis run ./kurtosis --args-file ./kurtosis/beaconkit-base-gcp.yaml \
@@ -66,7 +43,7 @@ stop-devnet:
 # Stops and removes the specified Kurtosis enclave
 reset-devnet:
 	$(MAKE) stop-devnet
-	kurtosis enclave rm my-local-devnet 
+	kurtosis enclave rm my-local-devnet
 
 # Removes the specified Kurtosis enclave
 rm-devnet: