chore(task-processor): add better logging for failed tasks

[matthewelwell]

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• [x] I have run pre-commit to check linting
• [ ] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

Adds better logging for failed tasks to help investigations where needed.

How did you test this code?

Updated an existing test to check for the correct log messages.

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3 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/E6Pb3zv9bKQxscsp54NHDFtVjGac)) | [Visit Preview](https://docs-git-chore-add-better-logging-for-failed-tasks-flagsmith.vercel.app) | | Jun 19, 2024 7:19am | | **flagsmith-frontend-preview** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-preview/BXzZgdWpVMmg35dZELxWCZfBiXBC)) | [Visit Preview](https://flagsmith-frontend-preview-git-chore-add-bette-69cdaa-flagsmith.vercel.app) | | Jun 19, 2024 7:19am | | **flagsmith-frontend-staging** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-staging/5WuDybCsVADJa1bfrAVc2p9sTnDG)) | [Visit Preview](https://flagsmith-frontend-staging-git-chore-add-bette-7cd48a-flagsmith.vercel.app) | | Jun 19, 2024 7:19am |

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Uffizzi Preview deployment-53186 was deleted.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.51%. Comparing base (b7c4f5f) to head (5b7bd31). Report is 7 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4186 +/- ## ======================================= Coverage 96.50% 96.51% ======================================= Files 1177 1177 Lines 38217 38230 +13 ======================================= + Hits 36883 36896 +13 Misses 1334 1334 ```

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