fix: support loading TimeSeries URL from sub-property of data (#5610)

[harrymander]

PR fulfills these requirements

• [x] Commit message(s) and PR title follows the format [fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made ex. fix: DEV-XXXX: Removed inconsistent code usage causing intermittent errors
• [ ] Tests for the changes have been added/updated (for bug fixes/features)
• [ ] Docs have been added/updated (for bug fixes/features)
• [ ] Best efforts were made to ensure docs/code are concise and coherent (checked for spelling/grammatical errors, commented out code, debug logs etc.)
• [x] Self-reviewed and ran all changes on a local instance (for bug fixes/features)

Change has impacts in these area(s)

(check all that apply)

• [ ] Product design
• [ ] Backend (Database)
• [ ] Backend (API)
• [x] Frontend

What does this fix?

Fixes https://github.com/HumanSignal/label-studio/issues/5610

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[hlomzik]

/jira create bug LEAP

[hlomzik]

@harrymander thank you! that's a very helpful and simple fix we really need! I'll run it through our internal process and will merge soon

[jombooth]

just closing because your code was merged to develop in https://github.com/HumanSignal/label-studio/pull/5883 for CI/process related reasons. We'll make sure you're credited in our next release!