Remove index no longer in use for unread_comment_count

Description

Remove any indexes acorss 'updated_at' field that are no longer in use for unread_comment_count.
Test removal of indexes under a load test.

Steps to Reproduce

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Reason for Variance

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Release Notes

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Assignee

Wajeeha Khalid

Reporter

Wajeeha Khalid

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Groups with Read-Only Access

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Actual Points

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Reach

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Impact

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Open edX Discourse Thread

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Platform Map Area (Levels 1 & 2)

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Platform Map Area (Levels 3 & 4)

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Blended Project Status Page

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Story Points

0.5

Priority

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