Track emoji metrics for a merge request
## Task: Track the following metrics with HLL tracking | Action | Description | |--------|-------------| | reaction_thumbs_up | Added thumbs up reaction to MR | | reaction_thumbs_down | Added thumbs down reaction to MR | | reaction_added | Added emoji reaction to MR | | reaction_removed | Removed emoji reaction to MR | | comment_reaction_added | Added emoji reaction to a comment in the MR | | comment_reaction_removed | Removed emoji reaction to a comment in the MR |
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