Fix time_frame for awarding_epic_emoji_weekly metric

What does this MR do and why?

Fix time_frame for redis_hll_counters.epics_usage.g_project_management_users_awarding_epic_emoji_weekly metric

Time frame should be 7d

Once we use instrumentation classes we use the time_frame defined in the metric definition YAML.

Related with testing https://gitlab.com/gitlab-org/gitlab/-/issues/338029

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