[landing] key competitor data

Summary:
In a subsequent diff we are going to want to access the competitor data by its key. This diff keys the competitorData so that we can do that

Depends on D8025

Test Plan: flow and this will be further tested in subsquent diffs

Reviewers: atul, kamil

Reviewed By: atul

Subscribers: ashoat, tomek, atul

Differential Revision: https://phab.comm.dev/D8028