ci/eval: remove ofborg references

By now, these files have been changed enough to not need the "vendored
from" notes anymore. These links would still be there when going through
the history of the file, but today GHA CI has not many similarities
anymore to what ofborg did, so these are not really helpful.

(cherry picked from commit 2aae142529)

ci/eval/attrpaths.nix

@@ -2,19 +2,12 @@
 # *superset* of all attrpaths of derivations which might be
 # part of a release on *any* platform.
 #
-# Both this expression and what ofborg uses (outpaths.nix)
-# are essentially single-threaded (under the current cppnix
-# implementation).
-#
-# This expression runs much, much, much faster and uses much, much
-# less memory than the ofborg script by skipping the
-# platform-relevance checks.  The ofborg outpaths.nix script takes
-# half an hour on a 3ghz core and peaks at 60gbytes of memory; this
-# expression runs on the same machine in 44 seconds with peak memory
-# usage of 5gbytes.
+# This expression runs single-threaded under all current Nix
+# implementations, but much faster and with much less memory
+# used than ./outpaths.nix itself.
 #
 # Once you have the list of attrnames you can split it up into
-# $NUM_CORES batches and run the platform checks separately for each
+# $NUM_CORES batches and evaluate the outpaths separately for each
 # batch, in parallel.
 #
 # To dump the attrnames:

ci/eval/compare/default.nix

@@ -105,7 +105,6 @@ let
           ) rebuildsByKernel
           # Set the "11.by: package-maintainer" label to whether all packages directly
           # changed are maintained by the PR's author.
-          # (https://github.com/NixOS/ofborg/blob/df400f44502d4a4a80fa283d33f2e55a4e43ee90/ofborg/src/tagger.rs#L83-L88)
           // {
             "11.by: package-maintainer" =
               maintainers ? ${githubAuthorId}

ci/eval/compare/maintainers.nix

@@ -1,7 +1,6 @@
 {
   lib,
 }:
-# Almost directly vendored from https://github.com/NixOS/ofborg/blob/5a4e743f192fb151915fcbe8789922fa401ecf48/ofborg/src/maintainers.nix
 {
   changedattrs,
   changedpathsjson,

ci/eval/outpaths.nix

@@ -2,8 +2,6 @@
 # When using as a callable script, passing `--argstr path some/path` overrides $PWD.
 #!nix-shell -p nix -i "nix-env -qaP --no-name --out-path --arg checkMeta true -f ci/eval/outpaths.nix"
 
-# Vendored from:
-#   https://raw.githubusercontent.com/NixOS/ofborg/74f38efa7ef6f0e8e71ec3bfc675ae4fb57d7491/ofborg/src/outpaths.nix
 {
   checkMeta,
   includeBroken ? true, # set this to false to exclude meta.broken packages from the output