Remove merge queue and default rules from Mergify (#2548)

Removed merge queue configuration and default queue rules from Mergify
settings.

SUMMARY:
"please provide a brief summary"


TEST PLAN:
"please outline how the changes were tested"

Signed-off-by: Dipika Sikka <dipikasikka1@gmail.com>

Author: dsikka

.github/mergify.yml

@@ -1,51 +1,4 @@
-merge_queue:
-  max_parallel_checks: 1
-
-queue_rules:
-  - name: default
-    merge_method: squash
-    batch_size: 1
-    commit_message_template: |
-      {{ title }} (#{{ number }})
-
-      {{ body }}
-    queue_conditions:
-      - check-success=DCO
-      - check-success=quality-check
-      - or:
-          - check-success=transformers-tests
-          - check-neutral=transformers-tests
-          - check-skipped=transformers-tests
-      - check-success=base-tests (3.10)
-      - check-success=base-tests (3.13)
-      - check-success=pytorch-tests (3.10)
-      - check-success=pytorch-tests (3.13)
-      - check-success=markdown-link-check
-    merge_conditions:
-      - check-success=DCO
-      - check-success=quality-check
-      - or:
-          - check-success=transformers-tests
-          - check-neutral=transformers-tests
-          - check-skipped=transformers-tests
-      - check-success=base-tests (3.10)
-      - check-success=base-tests (3.13)
-      - check-success=pytorch-tests (3.10)
-      - check-success=pytorch-tests (3.13)
-      - check-success=markdown-link-check
-
 pull_request_rules:
-  - name: Automatically merge when ready
-    conditions:
-      - base=main
-      - label=ready
-      - "#approved-reviews-by>=2"
-      - -conflict
-      - -draft
-    actions:
-      queue:
-        name: default
-
   - name: label-documentation
     description: Automatically apply documentation label
     conditions: