Backport into 1.16 of NET-6944 - Replace usage of deprecated Envoy field envoy.extensions.filters.http.lua.v3.Lua.inline_code (#20053)

NET-6944 - Replace usage of deprecated Envoy field envoy.extensions.filters.http.lua.v3.Lua.inline_code (#20012)

.changelog/20012.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+xds: replace usage of deprecated Envoy field `envoy.extensions.filters.http.lua.v3.Lua.inline_code`
+```

agent/envoyextensions/builtin/lua/lua.go

@@ -6,6 +6,7 @@ package lua
 import (
 	"errors"
 	"fmt"
+	envoy_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
 
 	envoy_listener_v3 "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
 	envoy_lua_v3 "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/http/lua/v3"
@@ -97,7 +98,11 @@ func (l *lua) PatchFilter(p extensioncommon.FilterPayload) (*envoy_listener_v3.F
 	luaHttpFilter, err := extensioncommon.MakeEnvoyHTTPFilter(
 		"envoy.filters.http.lua",
 		&envoy_lua_v3.Lua{
-			InlineCode: l.Script,
+			DefaultSourceCode: &envoy_core_v3.DataSource{
+				Specifier: &envoy_core_v3.DataSource_InlineString{
+					InlineString: l.Script,
+				},
+			},
 		},
 	)
 	if err != nil {

agent/xds/testdata/builtin_extension/listeners/lambda-and-lua-connect-proxy.latest.golden

@@ -224,7 +224,9 @@
                     "name": "envoy.filters.http.lua",
                     "typedConfig": {
                       "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua",
-                      "inlineCode": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      "defaultSourceCode": {
+                        "inlineString": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      }
                     }
                   },
                   {

agent/xds/testdata/builtin_extension/listeners/lua-inbound-applies-to-inbound.latest.golden

@@ -179,7 +179,9 @@
                     "name": "envoy.filters.http.lua",
                     "typedConfig": {
                       "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua",
-                      "inlineCode": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      "defaultSourceCode": {
+                        "inlineString": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      }
                     }
                   },
                   {

agent/xds/testdata/builtin_extension/listeners/lua-inbound-doesnt-apply-to-local-upstreams.latest.golden

@@ -215,7 +215,9 @@
                     "name": "envoy.filters.http.lua",
                     "typedConfig": {
                       "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua",
-                      "inlineCode": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      "defaultSourceCode": {
+                        "inlineString": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      }
                     }
                   },
                   {

agent/xds/testdata/builtin_extension/listeners/lua-outbound-applies-to-local-upstreams-tproxy.latest.golden

@@ -58,7 +58,9 @@
                     "name": "envoy.filters.http.lua",
                     "typedConfig": {
                       "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua",
-                      "inlineCode": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      "defaultSourceCode": {
+                        "inlineString": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      }
                     }
                   },
                   {
@@ -102,7 +104,9 @@
                     "name": "envoy.filters.http.lua",
                     "typedConfig": {
                       "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua",
-                      "inlineCode": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      "defaultSourceCode": {
+                        "inlineString": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      }
                     }
                   },
                   {

agent/xds/testdata/builtin_extension/listeners/lua-outbound-applies-to-local-upstreams.latest.golden

@@ -44,7 +44,9 @@
                     "name": "envoy.filters.http.lua",
                     "typedConfig": {
                       "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua",
-                      "inlineCode": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      "defaultSourceCode": {
+                        "inlineString": "\nfunction envoy_on_request(request_handle)\n  request_handle:headers():add(\"test\", \"test\")\nend"
+                      }
                     }
                   },
                   {