chore: Remove signoff requirements check for pull requests

.github/CODEOWNERS

@@ -1,8 +1,2 @@
 # Automatically request reviews from the synapse-core and dendrite-core teams when a pull request comes in.
-* @matrix-org/synapse-core @matrix-org/dendrite-core
-
-# For modifications to complement internals, also directly request review from Kegan.
-/build/ @matrix-org/synapse-core @matrix-org/dendrite-core @kegsay
-/cmd/ @matrix-org/synapse-core @matrix-org/dendrite-core @kegsay
-/internal/ @matrix-org/synapse-core @matrix-org/dendrite-core @kegsay
-/runtime/ @matrix-org/synapse-core @matrix-org/dendrite-core @kegsay
+* @famedly/matrix-team

.github/workflows/ci.yaml

@@ -7,10 +7,6 @@ on:
   workflow_dispatch:
 
 jobs:
-  check-signoff:
-    if: "github.event_name == 'pull_request'"
-    uses: "matrix-org/backend-meta/.github/workflows/sign-off.yml@v2"
-
   complement-internal:
     runs-on: ubuntu-latest
     steps:
@@ -40,7 +36,7 @@ jobs:
       matrix:
         include:
           - homeserver: Synapse
-            repo: element-hq/synapse
+            repo: famedly/synapse
             tags: synapse_blacklist
             packages: ./tests/msc3874 ./tests/msc3902 ./tests/msc4306
             env: "COMPLEMENT_ENABLE_DIRTY_RUNS=1 COMPLEMENT_SHARE_ENV_PREFIX=PASS_ PASS_SYNAPSE_COMPLEMENT_DATABASE=sqlite"