google#1762 added
automatic fetch trace logging for each individual file extracted from a
`.zip` file. Many of these operations are very fast, especially for
`otatools.zip` and take many lines of logs. These should be condensed
since they don't contribute much to the overall time and make the trace
harder to read.

Sample new output:
```
Performance stats:
PreFetch actions:
 started: 2025-11-25 15:52:13, duration: 1 s
 - GetBuilds: 1 s
Host Package:
 started: 2025-11-25 15:52:14, duration: 3 m 13 s
 - Download: 3 m 6 s, 851 MiB
 - Extract: 6 s
 - 2 operations omitted with a combined duration of 12 ms.
Default:
 started: 2025-11-25 15:52:14, duration: 7 m 33 s
 - Downloaded 'misc_info.txt': 1 s, 9000 B
 - Downloaded 'aosp_cf_x86_64_only_phone-img-14496483.zip': 7 m 23 s, 1135 MiB
 - Extracted 'super.img' from 'aosp_cf_x86_64_only_phone-img-14496483.zip': 7 s, 1339 MiB
 - Desparsed [/super.img]: 933 ms, 8192 MiB
 - 22 operations omitted with a combined duration of 549 ms.
Kernel:
 started: 2025-11-25 15:59:47, duration: 8 ms
 - 4 operations omitted with a combined duration of 8 ms.
OTA Tools:
 started: 2025-11-25 15:59:47, duration: 1 m 54 s
 - Downloaded 'otatools.zip': 1 m 51 s, 486 MiB
 - 14653 operations omitted with a combined duration of 3 s.
```

Bug: b/463765667