Web IDE: Remove properties branchId, projectId and url from the file object

Himanshu Kapoorrequested to merge
222510-projectid-branchid into master

What does this MR do?

In the Web IDE only a single project can be opened at a time, so projectId and branchId aren't needed on a file. Also those properties were used to derive the url property, which is now turned into a getter.

References

Edited by Himanshu Kapoor

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