Disable RLS packaging for 1.20

[brson]

RLS is still not shipping but is in tree. In 1.19 it was disabled in a backport, so that needs to be done again for 1.20. I might prefer that it is disabled on master and then backported.

cc #42357

[alexcrichton]

Handled in #43307, specifically b15382f.

@cuviper if this is still an issue in packaging though please feel free to reopen!