* MM-54201 Move ExplicitMentions to its own file and rename it (#24932)
* MM-54201 Move ExplicitMentions to its own file and rename it
* Fix vet
* MM-54201 Refactor current mention parsing into MentionParserStandard (#24936)
* MM-54201 Refactor current mention parsing into MentionParserStandard
* Fix vet
* MM-54201 Unify user and group mention parsing logic (#24937)
* MM-54201 Add MentionKeywords type
* MM-54201 Move group mentions into MentionKeywords
* Fix flaky test caused by random iteration order
* Update server/channels/app/mention_results.go
Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
* Address feedback
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Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
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Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
