DO NOT MERGE: test dual-condition monitor with cache-only memory pressure

[devin-ai-integration]

This PR targets the following PR:

• feat(cdk): enable fail-fast shutdown on memory threshold with dual-condition check #962

---

Summary

Adds a synthetic cache memory pressure scenario in AirbyteEntrypoint.read() to test the negative case of the dual-condition memory monitor (introduced in #962). For each consumed record, a 10 MB file-backed shared mmap page is created on /dev/shm, which inflates cgroup memory usage without increasing the Python process's anonymous RSS (RssAnon).

This validates that the memory monitor correctly does not raise AirbyteTracedException when container memory is high but the pressure comes from file-backed/shared pages rather than process-private anonymous memory.

DO NOT MERGE — test-only change to validate memory monitor behavior.

Companion PR: #969 (tests the positive case — process RSS growth triggers fail-fast)

Review & Testing Checklist for Human

• Verify this PR is never merged to a release branch
• Deploy a connector using this branch in a memory-bounded container and confirm cgroup usage climbs toward the limit
• Confirm that RssAnon in /proc/self/status remains low relative to the container limit
• Verify the memory monitor logs the "pressure likely from file-backed or reclaimable pages — not raising" info message instead of raising an exception
• Confirm the sync completes (or is killed by the OOM killer) without a graceful AirbyteTracedException shutdown

Notes

• The mmap pages and file descriptors are intentionally never closed — the goal is to accumulate memory pressure throughout the sync
• Uses tempfile.mktemp (which has a theoretical race condition) rather than tempfile.mkstemp; acceptable for a throwaway test branch
• Each record creates a 10 MB mmap'd file on /dev/shm; memory growth rate depends on record throughput
• Pattern is the counterpart to DO NOT MERGE: test graceful OOM shutdown via intentional memory leak #969, which tests that process-private memory growth does trigger fail-fast

Link to Devin session: https://app.devin.ai/sessions/070ecb51ceee4f9189e1c09a83ba31cb

[devin-ai-integration]

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[github-actions]

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[github-actions]

PyTest Results (Fast)

3 943 tests  ±0   3 932 ✅ ±0   7m 37s ⏱️ -10s
    1 suites ±0      11 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 5a29758. ± Comparison against base commit 6c2cd9c.

[github-actions]

PyTest Results (Full)

3 946 tests  ±0   3 934 ✅ ±0   10m 49s ⏱️ -8s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 5a29758. ± Comparison against base commit 6c2cd9c.

[Patrick Nilan (pnilan)]

/prerelease

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