feat(ci): add support for running vision inference tests (#2972)

This PR significantly refactors the Integration Tests workflow. The main
goal behind the PR was to enable recording of vision tests which were
never run as part of our CI ever before. During debugging, I ended up
making several other changes refactoring and hopefully increasing the
robustness of the workflow.

After doing the experiments, I have updated the trigger event to be
`pull_request_target` so this workflow can get write permissions by
default but it will run with source code from the base (main) branch in
the source repository only. If you do change the workflow, you'd need to
experiment using the `workflow_dispatch` triggers. This should not be
news to anyone using Github Actions (except me!)

It is likely to be a little rocky though while I learn more about GitHub
Actions, etc. Please be patient :)

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

tests/integration/recordings/responses/7354ec181984.json

@@ -20,15 +20,15 @@
       "__type__": "ollama._types.GenerateResponse",
       "__data__": {
         "model": "llama3.2:3b-instruct-fp16",
-        "created_at": "2025-07-29T21:56:26.022261Z",
+        "created_at": "2025-07-31T17:51:16.201313167Z",
         "done": true,
         "done_reason": "stop",
-        "total_duration": 6323034167,
-        "load_duration": 107456542,
+        "total_duration": 27475921912,
+        "load_duration": 40564716,
         "prompt_eval_count": 25,
-        "prompt_eval_duration": 69246125,
+        "prompt_eval_duration": 964907432,
         "eval_count": 150,
-        "eval_duration": 6145775458,
+        "eval_duration": 26469935419,
         "response": "The smallest country in the world is the Vatican City, which has a total area of approximately 0.44 km\u00b2 (0.17 sq mi). It is an independent city-state located within Rome, Italy, and is home to the Pope and the central government of the Catholic Church.\n\nTo put that into perspective, the Vatican City is smaller than a golf course! Despite its tiny size, it has its own government, currency, postal system, and even its own police force. It's also home to numerous iconic landmarks like St. Peter's Basilica and the Sistine Chapel.\n\nInterestingly, the Vatican City is not only the smallest country in the world but also the most densely populated, with a population of just over 800 people!",
         "thinking": null,
         "context": null