tests: fix the flaky test test-logtoprocess.t
The main change is that we're waiting for the [touched] file to appear for 5 seconds instead of 0.1 seconds. Also, instead of implementing wait-on-file from scratch, we use the existing one from testlib/ that works well.
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2