Reorganize server and service test runner (#2781)

core/server/analytics.js

core/server/in-process-server-test-helpers.js

core/server/log.js

core/server/log.spec.js

core/server/monitor.js

core/server/prometheus-metrics.js

core/server/prometheus-metrics.spec.js

core/server/rate-limit.js

core/server/secret-is-valid.js

core/server/server.js

core/server/server.spec.js

core/service-test-runner/cli.js

core/service-test-runner/infer-pull-request.js

core/service-test-runner/infer-pull-request.spec.js

core/service-test-runner/pull-request-services-cli.js

core/service-test-runner/runner.js

core/service-test-runner/services-for-title.js

core/service-test-runner/services-for-title.spec.js

lib/redis-token-persistence.js

lib/request-handler.js