re-enable workspace root importfor coverage lense

[BenTheElder]

see: #21563, https://github.com/bazelbuild/rules_nodejs/wiki#no-longer-link-the-workspace-root

[BenTheElder]

needs testing, but theoretically this seems to bring back the previously relied upon behavior before we upgraded from 0.36 to 3.1

[BenTheElder]

unable to verify this change currently due to bazelbuild/bazel#13379 + python (2.x) being removed from our workstations. i'll look into a workaround

[BenTheElder]

curling spyglass/static/coverage/script_bundle.min.js contains the minified parseCoverage method exported by the imported parser module, whereas the one on prow.k8s.io has a literal import {parseCoverage} from "io_k8s_test_infra/gopherage/cmd/html/static/parser"; presumably that wasn't resolved at build time and won't work.

this should fix the issue.

edit: sudo apt-get install python-is-python3 for the workaround to get bazel running again.

[MushuEE]

/lgtm

[amwat]

/lgtm
/approve

was able to verify this locally

[k8s-ci-robot]

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This pull-request has been approved by: amwat, BenTheElder

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