rtla: Add the ability to create ctags and etags

rtla: Add the ability to create ctags and etags

- Add the ability to create and remove ctags and etags, using the following
make tags
make TAGS
make tags_clean

- fix a comment in Makefile.rtla with the correct spelling and don't
  imply that the ability to create an rtla tarball will be removed

Cc: Tomas Glozar <tglozar@redhat.com>
Cc: "Luis Claudio R . Goncalves" <lgoncalv@redhat.com>
Link: https://lore.kernel.org/20250321175053.29048-1-jkacur@redhat.com
Signed-off-by: John Kacur <jkacur@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>