patch converter tool

[gsaudade99]

  File "/opt/galaxy/server/lib/galaxy/datatypes/converters/gff_to_bed_converter.py", line 27
    out.write(f"{elems[0]}\t{start}\t{elems[4]}\t{name}\t0\t{strand}\n")
                                                                      ^
SyntaxError: invalid syntax

This is because the tool was running with the legacy container with an older version of python. We can either run it as an internal tool or add a specific container with python > 3.6.

This patch is live and working (:

[bgruening]

I'm going to merge this, but I think we should add more comments to those tools, why we add them ... at some point we want to work on it and make them run in normal containers I think.