test: Attempt to fix flaky equivocation test

[romac]

No description provided.

[romac]

Still seems flaky when running it in a loop locally

[romac]

For anyone interested, here is the script I am using the check for flakiness:

#!/bin/bash

# Configuration
# Usage: ./flake_check.sh [number_of_runs]
MAX_RUNS=${1:-50} # Default to 50 runs if no argument provided
CMD="cargo nextest run -p informalsystems-malachitebft-test --test it equivocation_two_vals_same_pk --retries 0"

echo "🔍 Starting Flake Detection"
echo "Target: $CMD"
echo "Plan: Run $MAX_RUNS times (or until failure)"
echo "---------------------------------------------------"

for ((i=1; i<=MAX_RUNS; i++)); do
    printf "Run #%d ... " "$i"
    
    # Run the command, capturing output to a temporary file
    if $CMD > last_run.log 2>&1; then
        echo "✅ PASSED"
    else
        echo "❌ FAILED"
        echo ""
        echo "The test failed on run #$i."
        echo "---------------------------------------------------"
        echo "Failure Logs:"
        cat last_run.log
        echo "---------------------------------------------------"
        rm last_run.log
        exit 1
    fi
done

rm last_run.log
echo "---------------------------------------------------"
echo "🎉 Success: The test survived $MAX_RUNS runs without failing."