[MM-49751] - Turn off Inactive Server Email (#22648)

* [MM-49751] - Turn off Inactive Server Email

* remove unused var

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Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/email/service.go

@@ -163,7 +163,6 @@ type ServiceInterface interface {
 	InitEmailBatching()
 	SendChangeUsernameEmail(newUsername, email, locale, siteURL string) error
 	CreateVerifyEmailToken(userID string, newEmail string) (*model.Token, error)
-	SendLicenseInactivityEmail(email, name, locale, siteURL string) error
 	Stop()
 }