[MM-4819] Add MinimumHashtagLength config (#10248)

#### Summary
Add `MinimumHashtagLength` config

#### Ticket Link
#9156 
https://mattermost.atlassian.net/browse/MM-4819

#### Checklist
N/A

config/client.go

@@ -35,6 +35,7 @@ func GenerateClientConfig(c *model.Config, diagnosticId string, license *model.L
 	props["EnableTesting"] = strconv.FormatBool(*c.ServiceSettings.EnableTesting)
 	props["EnableDeveloper"] = strconv.FormatBool(*c.ServiceSettings.EnableDeveloper)
 	props["PostEditTimeLimit"] = fmt.Sprintf("%v", *c.ServiceSettings.PostEditTimeLimit)
+	props["MinimumHashtagLength"] = fmt.Sprintf("%v", *c.ServiceSettings.MinimumHashtagLength)
 	props["CloseUnusedDirectMessages"] = strconv.FormatBool(*c.ServiceSettings.CloseUnusedDirectMessages)
 	props["EnablePreviewFeatures"] = strconv.FormatBool(*c.ServiceSettings.EnablePreviewFeatures)
 	props["EnableTutorial"] = strconv.FormatBool(*c.ServiceSettings.EnableTutorial)