refactor: remove redundant code

[johanbook]

🚀	This description was created by Ellipsis for commit 394dcff

Summary:

Refactored getWriteKey in standalone-analytics.ts to remove redundant script tag parsing, simplifying the write key retrieval process.

Key points:

• Removed redundant script tag parsing code from getWriteKey in standalone-analytics.ts.
• Simplified write key retrieval, relying on embeddedWriteKey() and getGlobalAnalytics().

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[ellipsis-dev]

❌ Changes requested. Reviewed everything up to 394dcff in 47 seconds

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[ellipsis-dev]

The removal of the script tag parsing logic in getWriteKey might lead to scenarios where the write key cannot be retrieved if it's not embedded or part of the global analytics object. This could break the analytics functionality where the script is dynamically loaded with the write key in the script's URL. Please ensure that all use cases for obtaining the write key are still supported after this change.