Release: 0.26.0-alpha1

Documentation

chore(ci): use Camunda maven settings and nexus cache to avoid download erros (#5685)
chore(deps): update dependency com.typesafe:config to v1.4.1 (#5671)
chore(deps): update version.elasticsearch to v6.8.13 (#5670)
chore(deps): update module zeebe-io/zeebe/clients/go to v0.25.0 (#5669)
chore(deps): update docker.elastic.co/kibana/kibana-oss docker tag to v6.8.13 (#5667)
Send slack notification on failure (#5665)
chore(ci): enable build status collection for all branches (#5656)
Fix cpu panel (#5654)
chore(ci): add TCK tests to build (#5653)
Add run/stop scripts for benchmarks (#5649)
Add randomized property tests for raft (#5622)
Try fix flaky HealthMonitoringTest and DeploymentClusteredTest (#5614)
chore(deps): update dependency com.google.api.grpc:proto-google-common-protos to v2 (#5607)
docs(all): remove documentation after migration to new repo (#5577)