Improve metrics output

Comienza con la salida de github/codeql-action/analyze mostrada en la ejecución del workflow enlazada y rastrea cómo se producen la tabla de métricas y el mensaje de baseline; el issue no menciona ningún archivo fuente ni ninguna prueba. Se considera terminado cuando las filas de métricas conservan las columnas de resultados distintivas, la sección de métricas está separada visualmente y la frase de baseline aparece una sola vez, dejando claro si el comportamiento pertenece a CodeQL CLI o a las Java queries.

Version

CodeQL CLI: 2.8.5
CodeQL action: 1.1.8 (according to CODEQL_ACTION_VERSION environment variable)

Description

Currently (at least for Java projects) the metrics table printed at the end of github/codeql-action/analyze contains the same metric name multiple times, e.g.:

|                          Metric                          | Value |
+----------------------------------------------------------+-------+
| Total lines of code in the database                      |  9668 |
| External libraries                                       |  1458 |
| External libraries                                       |    28 |
| External libraries                                       |     9 |
| External libraries                                       |     7 |
| External libraries                                       |     6 |
| External libraries                                       |     1 |
| Supported sinks in external libraries                    |     7 |
| Supported sinks in external libraries                    |     6 |
| Supported sinks in external libraries                    |     4 |
| Supported sinks in external libraries                    |     2 |
| Supported sinks in external libraries                    |     1 |
| Supported sinks in external libraries                    |     1 |
| Supported sinks in external libraries                    |     1 |
| Supported sinks in external libraries                    |     1 |
| Supported flow steps in external libraries               |    82 |
| Supported flow steps in external libraries               |    42 |
| Supported flow steps in external libraries               |    36 |
| Supported flow steps in external libraries               |    30 |
| Supported flow steps in external libraries               |    25 |
...

(workflow run)

The issue might be that these queries have multiple result columns, but the table here only seems to contain the usages count, discarding the other columns. Maybe the underlying issue is therefore caused by CodeQL CLI or by the Java queries.

Additionally it might be good to add an empty line in front of "Analysis produced the following metric data:" (to separate it more clearly from the previous table). And also the "Counted a baseline of ..." sentence seems to be printed twice (workflow run).