Clear out Dynamo cache in between tests

[anijain2305]

Summary: This issue was discovered when we tried to land https://www.internalfb.com/diff/D66189091. There is nothing wrong with D66189091, it just changes the way Dynamo invalidates its cache entry. However, it upsets these tests because they unintentionally rely on the Dynamo old behavior of invalidting cache entries.

Reviewed By: kimishpatel

Differential Revision: D66255174

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6990

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❗ 1 Active SEVs

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• [DomainsOnly] Jobs fail with GLIBC version not found

❌ 5 New Failures, 2 Unrelated Failures

As of commit 9110c76 with merge base 359e9d3 ():

NEW FAILURES - The following jobs have failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  ##[error]fatal: unable to access 'https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/': Failed to connect to git.mlplatform.org port 443 after 27 ms: Couldn't connect to server
• pull / test-models-linux (buck2, mv3, portable, linux.2xlarge, 90) / linux-job (gh)
  ##[error]fatal: unable to access 'https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/': Failed to connect to git.mlplatform.org port 443 after 26 ms: Couldn't connect to server
• pull / test-models-linux (buck2, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh)
  ##[error]fatal: unable to access 'https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/': Failed to connect to git.mlplatform.org port 443 after 34 ms: Couldn't connect to server
• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  ##[error]fatal: unable to access 'https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/': Failed to connect to git.mlplatform.org port 443 after 4 ms: Couldn't connect to server
• pull / unittest / macos / macos-job (gh)
  ##[error]fatal: unable to access 'https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/': Failed to connect to git.mlplatform.org port 443 after 36 ms: Couldn't connect to server

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-models-linux (cmake, mv3, portable, linux.2xlarge, 90) / linux-job (gh) (trunk failure)
  ##[error]fatal: unable to access 'https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/': Failed to connect to git.mlplatform.org port 443 after 1 ms: Couldn't connect to server
• pull / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh) (trunk failure)
  ##[error]fatal: unable to access 'https://git.mlplatform.org/ml/ethos-u/ethos-u-core-driver.git/': Failed to connect to git.mlplatform.org port 443 after 1 ms: Couldn't connect to server

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This pull request was exported from Phabricator. Differential Revision: D66255174