CityMall is using k8s spark operator

[murthy95]

• Use spark to run data migration jobs.

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[zevisert]

PRs updating who-is-using can be merged to clean up the backlog of open MRs:

• Adding moengage to who-is-using #1808
• CityMall is using k8s spark operator #1795
• chore: Add Timo to user list #1615
• Update who-is-using #1449

[vara-bonthu]

/lgtm

[vara-bonthu]

@murthy95 Please resolve the conflicts so that we can merge the PR