Mark Verify files as lf and utf8 according to the recommended settings (#41992)

See https://github.com/VerifyTests/Verify?tab=readme-ov-file#text-file-settings

Author: SimonCropp

.editorconfig

@@ -506,5 +506,12 @@ dotnet_diagnostic.IDE0040.severity = warning
 [*.txt]
 insert_final_newline = false
 
-[test/dotnet-new.Tests/**/Approvals/**]
-trim_trailing_whitespace = false
+# Verify settings
+[*.{received,verified}.{txt,xml,json}]
+charset = "utf-8-bom"
+end_of_line = lf
+indent_size = unset
+indent_style = unset
+insert_final_newline = false
+tab_width = unset
+trim_trailing_whitespace = false

.gitattributes

@@ -55,4 +55,9 @@
 
 *.jpg  	binary
 *.png 	binary
-*.gif 	binary
+*.gif 	binary
+
+# VerifyTests
+*.verified.txt text eol=lf working-tree-encoding=UTF-8
+*.verified.xml text eol=lf working-tree-encoding=UTF-8
+*.verified.json text eol=lf working-tree-encoding=UTF-8