Add rake task for updating fallback knapsack report for e2e specs
What does this MR do and why?
Add rake task to automate updates of master_report.json
for knapsack fallback option.
While this report isn't used often, it is used as a fallback option in cases if appropriate report download from GCS failed or when adding new parallel jobs which don't have specific report yet.
Closes: gitlab-org/quality/quality-engineering/team-tasks#2506 (closed)
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Edited by Andrejs Cunskis