[BugFix] Fix suite filtering

[douglasdotc]

Description

Recently there is an issue when we try to run a collection of suite with filtering:

$ VNC_PORT=XX VNC_HOST=duckstation2998 yarf --platform=Vnc ./tests/desktop-installer/ -- --suite "Noble.Entire-Disk"
INFO:yarf.rf_libraries.suite_parser:Selected assets:
  installer.resource
  common/common.resource
  ...
==============================================================================
desktop-installer                                                             
==============================================================================
desktop-installer                                                     | SKIP |
0 tests, 0 passed, 0 failed
==============================================================================
Output:  /tmp/yarf-outdir/output.xml
[ ERROR ] Suite 'desktop-installer' contains no tests.

After investigation, it looks like the way RobotFramework used to accept filters has changed and requires the parent directory.

This PR add processing to the suites passed by the user by adding the directory name (suite.name) to each of the suites before filtering them.

Resolved issues

closes #18

Documentation

Tests

Updated unit test.

Try to run yarf with --suite filter. The error above should be gone.

[andersson1234]

LGTM!