refactor: replace task processor

[matthewelwell]

Thanks for submitting a PR! Please check the boxes below:

• [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

Replace the Task Processor code (which is currently split between this repo and https://github.com/Flagsmith/flagsmith-task-processor) with a direct poetry dependency instead.

How did you test this code?

All the unit tests have been moved to the task-processor repository. There are tests through this repo that still test the integration with the task processor.

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Name	Status	Preview	Comments	Updated (UTC)
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Uffizzi Preview deployment-53213 was deleted.

[matthewelwell]

Converting to draft to:

1. ~Fix isort issues~
2. ~Wait until I can bump to 1.0.0 (which requires an update in flagsmith-workflows)~

[codecov[bot]]

Codecov Report

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

Project coverage is 96.77%. Comparing base (759e745) to head (6b8c827). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4189 +/- ## ========================================== + Coverage 96.61% 96.77% +0.16% ========================================== Files 1196 1159 -37 Lines 39123 38069 -1054 ========================================== - Hits 37797 36842 -955 + Misses 1326 1227 -99 ```

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flagsmith-frontend image build and security scan finished :sparkles:

Image	Build Status	Security report
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[github-actions[bot]]

flagsmith-api image build and security scan finished :sparkles:

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ghcr.io/flagsmith/flagsmith-api:pr-4189	Finished :white_check_mark:	Results :white_check_mark:

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flagsmith-private-cloud image build and security scan finished :sparkles:

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flagsmith image build and security scan finished :sparkles:

Image	Build Status	Security report
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flagsmith-e2e image build finished :sparkles:

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ghcr.io/flagsmith/flagsmith-e2e:pr-4189	Finished :white_check_mark:	Skipped

[github-actions[bot]]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4189	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4189	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4189	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-api:pr-4189	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith:pr-4189	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4189	Finished :white_check_mark:	Results :white_check_mark:

[matthewelwell]

I have verified that there haven't been any more changes in the task_processor module in this repo. Once CI passes, I will merge.