MM-36764 mlog refactor (#18118)

Refactor mlog
- simplify mlog by removing redundant code
- remove Zap dependency
- update unit test helpers
- update logging config
- update auditing

go.sum

@@ -655,6 +655,20 @@ github.com/mattermost/ldap v0.0.0-20201202150706-ee0e6284187d h1:/RJ/UV7M5c7L2TQ
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+github.com/mattermost/logr/v2 v2.0.4 h1:LiqvzNNfia23hlu1zmmCDmjqmSfwWNsEtFlL4/7jf8o=
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+github.com/mattermost/logr/v2 v2.0.7 h1:rcwGa3faMWa/0k841FZhrcb8qZexfV8sk9ZVCV/8KUg=
+github.com/mattermost/logr/v2 v2.0.7/go.mod h1:mpPp935r5dIkFDo2y9Q87cQWhFR/4xXpNh0k/y8Hmwg=
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 github.com/mattermost/rsc v0.0.0-20160330161541-bbaefb05eaa0 h1:G9tL6JXRBMzjuD1kkBtcnd42kUiT6QDwxfFYu7adM6o=
 github.com/mattermost/rsc v0.0.0-20160330161541-bbaefb05eaa0/go.mod h1:nV5bfVpT//+B1RPD2JvRnxbkLmJEYXmRaaVl15fsXjs=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=