Pass the server's version in trial request payload (#30911)

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

server/channels/app/license.go

@@ -48,6 +48,7 @@ func (ch *Channels) RequestTrialLicenseWithExtraFields(requesterID string, trial
 		CompanyName:           trialRequest.CompanyName,
 		CompanySize:           trialRequest.CompanySize,
 		CompanyCountry:        trialRequest.CompanyCountry,
+		ServerVersion:         model.CurrentVersion,
 	}
 
 	if !sanitizedRequest.IsValid() {

server/public/model/license.go

@@ -91,6 +91,7 @@ type TrialLicenseRequest struct {
 	CompanyName           string `json:"company_name"`
 	CompanyCountry        string `json:"company_country"`
 	CompanySize           string `json:"company_size"`
+	ServerVersion         string `json:"server_version"`
 }
 
 // If any of the below fields are set, this is not a legacy request, and all fields should be validated