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/b14ff438ca99.json

@@ -20,15 +20,15 @@
       "__type__": "ollama._types.GenerateResponse",
       "__data__": {
         "model": "llama3.2:3b-instruct-fp16",
-        "created_at": "2025-07-29T21:56:31.274826Z",
+        "created_at": "2025-07-31T17:51:39.104140157Z",
         "done": true,
         "done_reason": "stop",
-        "total_duration": 5223804916,
-        "load_duration": 61370666,
+        "total_duration": 22895811031,
+        "load_duration": 41692686,
         "prompt_eval_count": 23,
-        "prompt_eval_duration": 70195875,
+        "prompt_eval_duration": 793961939,
         "eval_count": 124,
-        "eval_duration": 5091701417,
+        "eval_duration": 22059637137,
         "response": "The official currency of Japan is the Japanese yen (\u00a5). It is abbreviated as \"JPY\" and its symbol is \u00a5. The yen is divided into 100 sen, although the sen has been officially discontinued since 1967.\n\nYou can exchange your money for yen at banks, currency exchange offices, or use ATMs to withdraw cash from an ATM. Credit cards are also widely accepted in Japan, especially among major retailers and restaurants.\n\nIt's worth noting that some businesses may not accept foreign currencies other than US dollars, so it's a good idea to have some local currency on hand when traveling to Japan.",
         "thinking": null,
         "context": null