Fix path traversal using job name in TaskLogger

What does this merge request do and why?

This MR fixes a that the TaskLogger doesn’t escape job names when generating the log file path.

This isn’t a problem yet but will likely cause one with !3726.

How to set up and validate locally

It’s hard to test right now. You could do this:

1. At the bottom of Rakefile, create a task:

   spinner_task 'test/task' do
     puts "woof"
   end

2. Run bundle exec rake 'test/task'
3. See the following error:

   rake aborted!
   test/task failed!
   See /Users/kev/development/gitlab/gdk/log/gdk/rake-2024-08-15_16-01-13_697/test-task.log for the task output.

On main the error would be:

rake aborted!
Errno::ENOENT: No such file or directory @ rb_sysopen - /Users/kev/development/gitlab/gdk/log/gdk/rake-2024-08-15_16-01-19_588/test/task.log (Errno::ENOENT)

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.