ci(ipa): Remove Evergreen config file

.evergreen.yml

@@ -1,23 +0,0 @@
-buildvariants:
-  - name: ubuntu
-    display_name: Ubuntu
-    run_on:
-      - ubuntu2204-small
-    tasks:
-      - write_and_set_downstream_expansions
-
-functions:
-  write repo name to downstream_expansions.yaml for Pine:
-    - command: shell.exec
-      params:
-        script: |
-          touch downstream_expansions.yaml
-          echo "pine_repo_name: ipa" | tee downstream_expansions.yaml
-
-tasks:
-  - name: write_and_set_downstream_expansions
-    commands:
-      - func: write repo name to downstream_expansions.yaml for Pine
-      - command: downstream_expansions.set
-        params:
-          file: downstream_expansions.yaml