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test(solid): deterministic hybrid async-generator hydration tests (#3636)

The `ssrSource 'hybrid' — async generator transition` group drove its
test-owned generators with `setTimeout(r, 5)` between yields and then
waited a fixed budget (30–100 ms) before asserting the final value. On a
loaded coverage runner the source's timer ticks plus scheduling exceeded
the budget and the assertion saw a yield still in flight
(`expected 2 to be 3`).

Replace the timers with test-released `deferred()` gates per yield and a
microtask drain + `flush()` (`tick()`), the same shape the
hybrid-{memo,store}-handoff specs already use. Every hop between a
released gate and the node's commit is a microtask, so the drain is a
property of the code rather than the clock. Each test now also asserts
the intermediate state after each release (duplicate discarded, then each
subsequent yield landing), which pins the handoff contract more tightly
than the single end-state check did.

Test-only; no changeset.

Co-authored-by: Claude via Cursor <noreply@cursor.com>

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