NOJIRA: Improve uniqueness of file naming for client coverage reports

[danailbd]

It's a pretty rare case but we've experienced some inconsistencies in gpii-app renderer processes coverage which makes use of the gpii.testem.coverage.express (coverageServer.js).

These are some changes of a collision of random numbers which are currently used for uniqueness of filenames. We could use a timestamp instead which should better ensure uniqueness.

[gpii-bot]

Could one of the admins verify that these changes are reasonable to test? If so, please reply with "ok to test".

[the-t-in-rtf]

Apologies for the extreme delay in looking at this. I think the changes are fine, but would like to see it run in CI. Can you merge with upstream main to pick up the CI configuration?

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