MM-62045 Enable eslint-plugin-jsx-a11y and fix occurrences of jsx-a11… #58

Job	Run time
master-ci / Check mocks	1m 53s
master-ci / Check app layers	38s
master-ci / Generate email templates	18s
master-ci / Check serialization methods for hot structs	20s
master-ci / Check go mod tidy	36s
master-ci / Check style	3m 15s
master-ci / Vet API	3m 37s
master-ci / Check migration files	9s
master-ci / Check mmctl docs	1m 47s
master-ci / Check store layers	19s
master-ci / golangci-lint	4m 52s
master-ci / MySQL to PostgreSQL Migration / MySQL -> Postgres Migration	6m 38s
master-ci / Build mattermost server app	13m 27s
master-ci / Postgres with binary parameters	0s
master-ci / MySQL / MySQL	1h 38m 31s
master-ci / Postgres / Postgres	1h 29m 21s
master-ci / Run mmctl tests / mmctl	34m 17s
	4h 19m 58s

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