Improved unread-, mention-icons #1

Job	Run time
master-ci / Check mocks	2m 49s
master-ci / Check serialization methods for hot structs	26s
master-ci / Check style	2m 6s
master-ci / Check go mod tidy	40s
master-ci / Vet API	2m 32s
master-ci / Check migration files	10s
master-ci / golangci-lint	2m 58s
master-ci / Check app layers	46s
master-ci / Generate email templates	23s
master-ci / Check mmctl docs	1m 33s
master-ci / Check store layers	30s
master-ci / MySQL to PostgreSQL Migration / MySQL -> Postgres Migration	4m 8s
master-ci / Postgres with binary parameters	0s
master-ci / Run mmctl tests	0s
master-ci / Build mattermost server app	0s
master-ci / MySQL	0s
master-ci / Postgres	0s
	19m 1s

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