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

web/context.go

@@ -35,7 +35,7 @@ func (c *Context) LogAuditRec(rec *audit.Record) {
 // LogAuditRec logs an audit record using specified Level.
 // If the context is flagged with a permissions error then `level`
 // is ignored and the audit record is emitted with `LevelPerms`.
-func (c *Context) LogAuditRecWithLevel(rec *audit.Record, level mlog.LogLevel) {
+func (c *Context) LogAuditRecWithLevel(rec *audit.Record, level mlog.Level) {
 	if rec == nil {
 		return
 	}