Add --verbose-errors flag to joshua tail for actionable test failure reproduction

[munozr1]

Currently, when joshua tests fail, the error output is not actionable. Users see "exit status 1" or raw XML traces without clear information about:

• Which specific test failed
• What random seed triggered the failure
• How to reproduce the failure locally

solution

Add a --verbose-errors flag to joshua tail that:

1. Scans stored trace logs for error events (Severity >= 40)
2. Extracts the TestFile and RandomSeed from the trace
3. Prints a formatted reproduction command alongside error details

Proposed behavior (joshua tail --verbose-errors):

[ERROR] Test: tests/fast/SimpleAtomicAdd.toml
Seed: 1424533409
Severity: 40
Error: Assertion failed in atomicOps.actor.cpp:142

Reproduce with:
./bin/fdbserver -r simulation -f tests/fast/SimpleAtomicAdd.toml -s 1424533409 -b on