ci: nightly apm-agent-microbenchmark failing

[carsonip]

nightly apm-agent-microbenchmark failing

[2026-07-03T14:31:03Z] $ git clone -v -- git@github.com:elastic/observability-robots.git .
[2026-07-03T14:31:03Z] fatal: destination path '.' already exists and is not an empty directory.
[2026-07-03T14:31:03Z] ⚠️ Warning: Checkout failed! cloning git repository: exit status 128 (Attempt 1/3 Retrying in 2s)
[2026-07-03T14:31:03Z] # Removing /var/lib/buildkite-agent/.buildkite-agent/builds/worker-1799330-build-hel1-dc1-hetzner-elasticnet-co/elastic/apm-agent-microbenchmark
[2026-07-03T14:31:03Z] 🚨 Error: Failed to remove "/var/lib/buildkite-agent/.buildkite-agent/builds/worker-1799330-build-hel1-dc1-hetzner-elasticnet-co/elastic/apm-agent-microbenchmark" (unlinkat /var/lib/buildkite-agent/.buildkite-agent/builds/worker-1799330-build-hel1-dc1-hetzner-elasticnet-co/elastic/apm-agent-microbenchmark/apm-agent-rum-js-07613c70b45c898e40188307b4a199320b2cf85b/packages/rum-react/node_modules/hoist-non-react-statics/CHANGELOG.md: permission denied)

https://buildkite.com/elastic/apm-agent-microbenchmark/builds/9036

[carsonip]

It is no longer failing but the benchmark content makes no sense: https://buildkite.com/elastic/apm-agent-microbenchmark/builds/9112#019f5ae6-f278-43e8-b813-fcf06885108e

[carsonip]

In any case, the apm-agent-microbenchmark is due to be removed by robots team shortly.