Pipeline for running optional firecracker integration tests

ci: Move away from using dir stacks

Failed in 20m 6s
:pipeline:
❓ m6a.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 33s
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Ran in 10m 40s
❓ m7a.metal-48xl al2023 linux_6.1./tools/devtool -y test --performance -c 1-10 -m 0 -- integration_tests/ -m 'no_block_pr and not nonci' --log-cli-level=INFO
Waited 12s
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Ran in 9m 34s
Total Job Run Time: 3h 39m