feat: LEAP-58: Proxy URL for Taxonomy if possible (#4918)

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* fix: LEAP-58: Add project-level presign API to support flat-file taxonomy in storage

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* ci: Build frontend

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* fix paths issue

* fix failing pytests

* associated frontend updates

* introduce some tavern tests for new + existing endpoint

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* additional function for freezing time

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* docs: LSF Update

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* 404 -> 400

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* fix testcases

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* fix comment

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Co-authored-by: hlomzik <hlomzik@gmail.com>
Co-authored-by: Jo Booth <jo.m.booth@gmail.com>
Co-authored-by: robot-ci-heartex <robot-ci-heartex@users.noreply.github.com>
Co-authored-by: MihajloHoma <MihajloHoma@users.noreply.github.com>