Fix version lookup and content-length handling

[niklub]

Summary

• avoid PackageNotFoundError when importing label_studio from source
• guard against missing Content-Length headers when importing tasks from URL
• add a small regression test for version import

Testing

• pytest tests/test_version.py -q
• pytest label_studio/tests/data_import/test_uploader.py::TestUploader::test_user_specified_block_without_default -q (fails: ModuleNotFoundError: No module named 'boto3')

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https://chatgpt.com/codex/tasks/task_e_683fa4aa69a083219b471edf1c236cc8

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: label_studio/data_import/uploader.py

Function	Unhandled Issue
tasks_from_url	[**ValidationError: "Failed to parse: { "id": 2, "data": { "image1": "https://m.media-amazon.com/images/I/810x8VKZbyL.AC_SL1500.jpg", "image2": "https://m.media-amazon.com/images/I/614ucfhtevL.jpg", "text1": "Let's rate your de...** ... Event Count: 1
tasks_from_url	ValidationError: ["HTTPSConnectionPool(host='101.43.178.136', port=8080): Max retries exceeded with url: / (Caused by ConnectTimeoutError(<urllib3.connection.HTTPSConnection object at 0x7fe8126dc470>, 'Connection to 101.43.178.136 timed out. (connect timeout=None)'))"] ... Event Count: 1

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