Pipeline for running optional firecracker integration tests

ci: Add secret hiding kernel to defaults buildkite

Failed in 17m 2s
:pipeline:
❓ m5n.metal ubuntu24 secret_hiding./tools/devtool -y test --performance -c 1-10 -m 0 -- integration_tests/ -m 'no_block_pr and not nonci' --log-cli-level=INFO
Waited 3m 11s
·
Ran in 10m 23s
❓ m6i.metal al2 linux_5.10./tools/devtool -y test --performance -c 1-10 -m 0 -- integration_tests/ -m 'no_block_pr and not nonci' --log-cli-level=INFO
Waited 2m 1s
·
Ran in 9m 32s
❓ m6a.metal al2 linux_5.10./tools/devtool -y test --performance -c 1-10 -m 0 -- integration_tests/ -m 'no_block_pr and not nonci' --log-cli-level=INFO
Waited 2m 53s
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Ran in 10m 15s
Total Job Run Time: 3h 50m