Use fbjni 0.7.0 and set ANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON

[pytorchbot]

Summary

Partial fix for #11597

We can upgrade to NDK 28 when fbjni upgrades.

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14420

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❌ 4 Cancelled Jobs, 1 Unrelated Failure

As of commit b3d2c9c with merge base e0dda90 ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• pull / test-models-linux (ic4, portable, linux.4xlarge.memory) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh)
  ##[error]The operation was canceled.
• pull / test-static-llama-qnn-linux / linux-job (gh)
  ##[error]The operation was canceled.
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest / windows / windows-job (gh) (matched win rule in flaky-rules.json)
  ##[error]The operation was canceled.

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