Add Mean and P99 latency to embeddings benchmark output

- Add "p99" to StatTypesAlias in console.py
- Update _get_stat_type_name_val() to handle p99
- Display mean, median, p95, and p99 latency in embeddings console output
- Remove embeddings_benchmarks.* files from git tracking (already in .gitignore)

This provides better comparison with vLLM bench serve results which show:
- Mean latency
- Median latency
- P99 latency

CSV and HTML outputs already included mean and p99.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Maryam Tahhan <mtahhan@redhat.com>

Author: maryamtahhan