Change IacsFilterFlag and KicsFilterFlag to StringSlice (AST-145741)

Convert the filter flags from String to StringSlice type to support multiple
filter values, improving the filtering capability for IACS and KICS scans.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: cx-aniket-shinde

internal/commands/scan.go

@@ -788,8 +788,8 @@ func scanCreateSubCommand(
 		commonParams.Branch, commonParams.BranchFlagUsage,
 	)
 	createScanCmd.PersistentFlags().String(commonParams.SastFilterFlag, "", commonParams.SastFilterUsage)
-	createScanCmd.PersistentFlags().String(commonParams.IacsFilterFlag, "", commonParams.IacsFilterUsage)
-	createScanCmd.PersistentFlags().String(commonParams.KicsFilterFlag, "", commonParams.KicsFilterUsage)
+	createScanCmd.PersistentFlags().StringSlice(commonParams.IacsFilterFlag, []string{}, commonParams.IacsFilterUsage)
+	createScanCmd.PersistentFlags().StringSlice(commonParams.KicsFilterFlag, []string{}, commonParams.KicsFilterUsage)
 
 	err = createScanCmd.PersistentFlags().MarkDeprecated(commonParams.KicsFilterFlag, "please use the replacement flag --iac-security-filter")
 	if err != nil {