fix(tests): increase shutdown deadlines from 200ms to 1s in parquet adaptive_schema tests

[AaronRM]

Change Summary

Increase shutdown timeouts in parquet adaptive_schema tests to address test flakiness on slow CI runs.

What issue does this PR close?

• Addresses a flaky test reported in Flaky Test Report (automated) #2720

How are these changes tested?

• Verified tests pass locally

Are there any user-facing changes?

No. This is a test-only change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.03%. Comparing base (9aa767e) to head (8f53ce2).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2812      +/-   ##
==========================================
- Coverage   86.03%   86.03%   -0.01%     
==========================================
  Files         704      704              
  Lines      264591   264588       -3     
==========================================
- Hits       227636   227633       -3     
  Misses      36431    36431              
  Partials      524      524              

Components	Coverage Δ
otap-dataflow	86.97% <100.00%> (-0.01%)	⬇️
query_abstraction	80.61% <ø> (ø)
query_engine	90.76% <ø> (ø)
otel-arrow-go	52.45% <ø> (ø)
quiver	92.25% <ø> (ø)

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