fix: remove docker-compose.redis_extra.yaml properly

[stasadev]

The Issue

I noticed that .ddev/docker-compose.redis_extra.yaml is not removed on add-on uninstall.

How This PR Solves The Issue

Removes it

Manual Testing Instructions

ddev dotenv set .ddev/.env.redis --redis-optimized=true
ddev add-on get https://github.com//ddev/ddev-redis/tarball/20250722_stasadev_cleanup
ddev add-on remove redis
rm -f .ddev/.env.redis
git status # should be clean

Automated Testing Overview

Release/Deployment Notes

[rfay]

Normally .ddev/docker-compose.redis_extra.yaml is not created by the add-on, true? So doesn't have #ddev-generated, so not truly our responsibility to remove it?

[stasadev]

It's created automatically in the optimized config:

ddev-redis/redis/scripts/setup-redis-optimized-config.sh

Line 6 in 46ee74a

extra_docker_file="${DDEV_APPROOT}/.ddev/docker-compose.redis_extra.yaml"

ddev-redis/redis/scripts/setup-redis-optimized-config.sh

Lines 55 to 69 in 46ee74a

	if [ ! -f "${extra_docker_file}" ] || grep -q '#ddev-generated' "${extra_docker_file}"; then
	cat >"${extra_docker_file}" <<EOF
	#ddev-generated
	services:
	redis:
	deploy:
	resources:
	limits:
	cpus: "2.5"
	memory: "768M"
	reservations:
	cpus: "1.5"
	memory: "512M"
	EOF
	fi