Rename usage of file to blob in Geo

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What does this MR do and why?

This MR fixes #517364 (closed) by renaming occurrences of File to Blob in the context of Geo. I tried to skim through the code base and docs to find other cases which need to be cleaned up.

🔧 with at Adfinis

References

• #517364 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Run Geo locally and navigate to /admin/geo/sites
  • Ensure Blob instead of File is shown as data type

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