Delete load dir and its file from qa dir

We now use k6 is a performance tool and this lives in its own pro-
ject, so I'm deleting the load directory and the file on it since
this is not in use anymore.

qa/load/artillery.yml

-config:
-  target: "{{ $processEnvironment.HOST_URL }}"
-  http:
-    pool: 10 # All HTTP requests from all virtual users will be sent over the same <pool> connections.
-             # This also means that there is a limit on the number of requests sent per second.
-  phases:
-    - duration: 30
-      arrivalRate: 10
-      name: "Warm up"
-    - duration: 90
-      arrivalRate: 10
-      rampTo: 100
-      name: "Gradual ramp up"
-    - duration: 90
-      arrivalRate: 100
-      name: "Sustained max load"
-scenarios:
-  - name: "Visit large issue url"
-    flow:
-      - get:
-          url: "{{ $processEnvironment.LARGE_ISSUE_URL }}"
-  - name: "Visit large MR url"
-    flow:
-      - get:
-          url: "{{ $processEnvironment.LARGE_MR_URL }}"