enhancement: introduce build time edition channels

be careful, the env:OC_EDITION, env:FRONTEND_EDITION, and conf:edition got removed as part of this commit, no deprecation because the flag is build time only!

(cherry picked from commit 40d8aacea4)

tests/acceptance/features/coreApiCapabilities/capabilities.feature

@@ -202,7 +202,7 @@ Feature: capabilities
                     "properties": {
                       "edition": {
                         "type": "string",
-                        "enum": ["%edition%"]
+                        "enum": ["dev"]
                       },
                       "product": {
                         "type": "string",
@@ -240,7 +240,7 @@ Feature: capabilities
               },
               "edition": {
                 "type": "string",
-                "enum": ["%edition%"]
+                "enum": ["dev"]
               },
               "product": {
                 "type": "string",

tests/acceptance/features/coreApiCapabilities/capabilitiesWithNormalUser.feature

@@ -58,7 +58,7 @@ Feature: default capabilities for normal user
                         "const": "%versionstring%"
                       },
                       "edition": {
-                        "const": "%edition%"
+                        "const": "dev"
                       },
                       "productname": {
                         "const": "%productname%"