E2E: Increase wait timeout for github import test

What does this MR do and why?

Describe in detail what your merge request does and why.

Increase the timeout for github import wait as the tests now randomly fail due to timeout.

This is most likely related to this change as it introduces processing of import in batches and with a delay: !85502 (merged)

Overall import time is not impacted, separate nightly test that tracks import times of a real project doesn't show any changes in overall import time. Only functional tests seem to be affected.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.

Closes #354388 (closed)