Fix production marketplace URL

Description

We changed the production marketplace URL to api.integrations.mattermost.com, but I never backported https://github.com/mattermost/mattermost-server/pull/12378 to v5.16, and we shipped with the invalid marketplace.integrations.mattermost.com instead.

has configured a second hostname to keep the feature working for v5.16 customers who migrate today, but I'd like to patch this earlier rather than later to allow us to converge back onto a single endpoint at some point in the future.

QA Test Steps

Mana

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Assignee

Jesse Hallam

QA Assignee

Prapti Shrestha

Reporter

Jesse Hallam

Epic Link

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Fix versions

Mattermost Team

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