remove redis token persistence backend (#9065)

.github/workflows/test-integration-17.yml

.github/workflows/test-integration.yml

CONTRIBUTING.md

config/local-shields-io-production.template.yml

core/token-pooling/redis-token-persistence.integration.js

core/token-pooling/redis-token-persistence.js

package-lock.json

package.json

scripts/redis-connectivity-test.js

server.js

services/github/github-constellation.js