fix(frontend): added export button on evaluation

[ashrafchowdury]

Description

This PR aims to add export data as CSV feature on evaluations.

Related Issue

Closes AGE-1021

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[mmabrouk]

Thanks a lot @ashrafchowdury !

I QA'ed the PR. I found this issue:

• When exporting the A/B test results, the data is not exported in the right format

Variant 1,Variant 2,Test set,Results,Both are good,Flag,Created on
app.default v1,app.fggf v2,country-app_testset,0% | 14.29%,0%,14.29%,"15 Oct 24, 00:00"

Here, we need to export in a parsable format, meaning instead of one Results column which has a string delimited by |.
Instead we want two columns for for Variant A the other Variant B and each having the number.

[mmabrouk]

Thanks @ashrafchowdury