Remove cluster log mention from documentation

[redcatbear]

Situation

We recently removed the host mount for the cluster logs from the code, but forgot to update the documentation.

Acceptance Criteria

• Section "Mapping Logs to a Directory on the Host" removed.

[kaklakariada]

See section https://github.com/exasol/exasol-testcontainers/blob/main/doc/user_guide/user_guide.md#mapping-logs-to-a-directory-on-the-host.

The method was removed in version 7.0.0, Issue #240 / PR #241

We can add a note mentioning using method ExasolContainer.addFileSystemBind() as a workaround:

ExasolContainer.addFileSystemBind(clusterLogsHostPath.toString(), "/exa/logs", BindMode.READ_WRITE);