[localization] Include template JSON files in OneLocBuild configuration. Fixes #20717 (#25717)

The `templatestrings.en.json` files in `dotnet/Templates/` were not included in the `LocProject.json` configuration, which meant OneLocBuild never picked them up for translation.

This PR replaces the static `LocProject.json.in` template with a `generate-loc-project.sh` script that dynamically discovers all `templatestrings.en.json` files and includes them in the generated `LocProject.json`.

This also fixes a duplicate entry for `Microsoft.Macios.Generator/Resources.resx` that was in the original `.in` file.

Hopefully fixes #20717

🤖 Pull request created by Copilot

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: rolfbjarne

tools/devops/LocProject.json.in

@@ -7,10 +7,8 @@ provision-shared.csx: provision-shared.in.csx Makefile $(TOP)/Make.config
 		-e 's#@XCODE_ROOT_PATH@#$(XCODE_DEVELOPER_ROOT)#g' \
 		$< > $@
 
-LocProject.json: LocProject.json.in Makefile $(TOP)/Make.config
-	$(Q_GEN) sed \
-		-e 's#@WORKING_DIRECTORY@#$(PWD)#g' \
-		$< > $(TOP)/Localize/$@;
+LocProject.json: generate-loc-project.sh Makefile $(TOP)/Make.config
+	$(Q_GEN) $(TOP)/tools/devops/generate-loc-project.sh "$(CURDIR)" "$(TOP)" > $(TOP)/Localize/$@;
 
 all check: check-sh check-yaml
 	@true

tools/devops/Makefile

@@ -0,0 +1,112 @@
+#!/bin/bash -eu
+
+set -o pipefail
+
+# This script generates the LocProject.json file for OneLocBuild.
+# It includes both the static .resx entries and dynamically discovered
+# template JSON files (templatestrings.en.json).
+
+WORKING_DIRECTORY="${1:-}"
+TOP="${2:-}"
+
+if [ -z "$WORKING_DIRECTORY" ] || [ -z "$TOP" ]; then
+	echo "Usage: $0 <working-directory> <top-directory>" >&2
+	exit 1
+fi
+
+# Start with the static .resx entries
+cat <<EOF
+{
+	"Projects": [
+	  {
+		"LanguageSet": "VS_Main_Languages",
+		"LocItems": [
+		  {
+			"SourceFile": "$WORKING_DIRECTORY/../../msbuild/Xamarin.Localization.MSBuild/MSBStrings.resx",
+			"Languages": "",
+			"CopyOption": "LangIDOnName",
+			"OutputPath": "$WORKING_DIRECTORY/../../msbuild/Xamarin.Localization.MSBuild/TranslatedAssemblies",
+			"LclFile": "",
+			"LciFile": "",
+			"Parser": "",
+			"LssFiles": []
+		  },
+		  {
+			"SourceFile": "$WORKING_DIRECTORY/../../tools/mtouch/Errors.resx",
+			"Languages": "",
+			"CopyOption": "LangIDOnName",
+			"OutputPath": "$WORKING_DIRECTORY/../../tools/mtouch/TranslatedAssemblies",
+			"LclFile": "",
+			"LciFile": "",
+			"Parser": "",
+			"LssFiles": []
+		  },
+		  {
+			"SourceFile": "$WORKING_DIRECTORY/../../src/Resources.resx",
+			"Languages": "",
+			"CopyOption": "LangIDOnName",
+			"OutputPath": "$WORKING_DIRECTORY/../../src/TranslatedAssemblies",
+			"LclFile": "",
+			"LciFile": "",
+			"Parser": "",
+			"LssFiles": []
+		  },
+		  {
+			"SourceFile": "$WORKING_DIRECTORY/../../src/rgen/Microsoft.Macios.Generator/Resources.resx",
+			"Languages": "",
+			"CopyOption": "LangIDOnName",
+			"OutputPath": "$WORKING_DIRECTORY/../../src/rgen/Microsoft.Macios.Generator/TranslatedAssemblies",
+			"LclFile": "",
+			"LciFile": "",
+			"Parser": "",
+			"LssFiles": []
+		  },
+		  {
+			"SourceFile": "$WORKING_DIRECTORY/../../src/rgen/Microsoft.Macios.Bindings.Analyzer/Resources.resx",
+			"Languages": "",
+			"CopyOption": "LangIDOnName",
+			"OutputPath": "$WORKING_DIRECTORY/../../src/rgen/Microsoft.Macios.Bindings.Analyzer/TranslatedAssemblies",
+			"LclFile": "",
+			"LciFile": "",
+			"Parser": "",
+			"LssFiles": []
+		  },
+		  {
+			"SourceFile": "$WORKING_DIRECTORY/../../tools/sharpie/Sharpie.Bind/Resources.resx",
+			"Languages": "",
+			"CopyOption": "LangIDOnName",
+			"OutputPath": "$WORKING_DIRECTORY/../../tools/sharpie/Sharpie.Bind/TranslatedAssemblies",
+			"LclFile": "",
+			"LciFile": "",
+			"Parser": "",
+			"LssFiles": []
+EOF
+
+# Add entries for all template localization JSON files
+ABSTOP=$(cd "$TOP" && pwd)
+find "$ABSTOP/dotnet/Templates" -name 'templatestrings.en.json' | sort | while read -r f; do
+	dir=$(dirname "$f")
+	cat <<EOF
+		  },
+		  {
+			"SourceFile": "$f",
+			"Languages": "",
+			"CopyOption": "LangIDOnName",
+			"OutputPath": "$dir",
+			"LclFile": "",
+			"LciFile": "",
+			"Parser": "",
+			"LssFiles": []
+EOF
+done
+
+# Close the JSON structure
+cat <<EOF
+		  }
+		],
+		"LssFiles": [],
+		"CloneLanguageSet": ""
+	  }
+	]
+}
+EOF