feat: DIA-2202: Support imported tasks that point to different buckets

[hakan458]

This use case was not supported before:

Import JSON tasks from bucket A
Inside these tasks, there are references to files in bucket B

Now instead of relying on Task.storage (the storage that the Task was imported from), we check all storages in the project, to see if the scheme (e.g. s3) PLUS the bucket name (e.g. my-bucket-b) match the task data's URI. If a matching storage is found, use that to resolve the URI.

[netlify]

✅ Deploy Preview for label-studio-storybook ready!

Name	Link
🔨 Latest commit	8b09cf9
🔍 Latest deploy log	https://app.netlify.com/sites/label-studio-storybook/deploys/681bcc278e1a62000874e6d5
😎 Deploy Preview	https://deploy-preview-7458--label-studio-storybook.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[netlify]

✅ Deploy Preview for label-studio-docs-new-theme canceled.

Name	Link
🔨 Latest commit	8b09cf9
🔍 Latest deploy log	https://app.netlify.com/sites/label-studio-docs-new-theme/deploys/681bcc27716e48000878ffd1

[netlify]

✅ Deploy Preview for heartex-docs canceled.

Name	Link
🔨 Latest commit	8b09cf9
🔍 Latest deploy log	https://app.netlify.com/sites/heartex-docs/deploys/681bcc278a27ca000879c582

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.07%. Comparing base (dc89b0d) to head (8b09cf9).
Report is 15 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/io_storages/s3/serializers.py	0.00%	2 Missing ⚠️
label_studio/io_storages/base_models.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7458   +/-   ##
========================================
  Coverage    78.07%   78.07%           
========================================
  Files          197      197           
  Lines        15835    15840    +5     
========================================
+ Hits         12363    12367    +4     
- Misses        3472     3473    +1     

Flag	Coverage Δ
pytests	78.07% <78.57%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[matt-bernstein]

/git merge develop

Workflow run
Successfully merged: create mode 100644 web/tools/extract-antd-no-reset/package.json

[matt-bernstein]

/fm sync

Workflow run