fix flaky LittDB test

[cody-littley]

Describe your changes and provide context

Fix flaky unit test

[cursor]

PR Summary

Low Risk
Only test assertions and random test parameters changed; no production LittDB or storage logic is modified.

Overview
Stabilizes LittDB disktable corruption/restart tests in disk_table_test.go without changing production behavior.

For truncated key/value file scenarios, truncation only picks a random non-zero length when the on-disk file has more than one byte (> 0 → > 1), avoiding edge cases where the file could be wiped to empty and assertions about missing keys would fail intermittently.

For metadata preserved on restart and orphaned metadata tests, configured TTL is now at least one hour (plus a small random jitter) instead of sub-second values, so background GC is unlikely to run during the brief close/reopen cycle and disturb metadata expectations.

^{Reviewed by Cursor Bugbot for commit 38d53c1. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 3, 2026, 12:07 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.28%. Comparing base (2151ba0) to head (38d53c1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3531      +/-   ##
==========================================
- Coverage   59.12%   58.28%   -0.85%     
==========================================
  Files        2213     2140      -73     
  Lines      182814   174431    -8383     
==========================================
- Hits       108096   101660    -6436     
+ Misses      64993    63725    -1268     
+ Partials     9725     9046     -679     

Flag	Coverage Δ
sei-chain-pr	66.13% <ø> (?)
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

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see 73 files with indirect coverage changes

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[wen-coding]

Looks good, but can you update title to say which flaky test we are fixing?