Switch to free runners for tests that run on Maestro (#3546)

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Task/Issue URL:
https://app.asana.com/0/1203301625297703/1208705705667488/f
Tech Design URL:
CC:

**Description**:

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**Steps to test this PR**:
1. Ideally, check [this
run](https://github.com/duckduckgo/iOS/actions/runs/11690377938) is
green. Realistically, check that it's not worse than usual in any way
that can be related to this change.

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.github/workflows/end-to-end.yml

@@ -68,7 +68,7 @@ jobs:
   end-to-end-tests:
     name: End to end Tests
     needs: build-end-to-end-tests
-    runs-on: macos-14-xlarge
+    runs-on: macos-14
     timeout-minutes: 90
     strategy:
       matrix:

.github/workflows/sync-end-to-end.yml

@@ -68,7 +68,7 @@ jobs:
   sync-end-to-end-tests:
     name: Sync End To End Tests
     needs: build-for-sync-end-to-end-tests
-    runs-on: macos-14-xlarge
+    runs-on: macos-14
     timeout-minutes: 90
     strategy:
       matrix: