Disable publishing for internal crates (#20986)

# Objective

- set `publish = false` for crates that won't be published

Author: mockersf

examples/no_std/library/Cargo.toml

@@ -2,6 +2,7 @@
 name = "no_std_library"
 version = "0.1.0"
 edition = "2024"
+publish = false
 
 # Normally we'd put all dependencies in [dependencies], but this syntax is easier to document
 [dependencies.bevy]

tools/export-content/Cargo.toml

@@ -2,6 +2,7 @@
 name = "export-content"
 version = "0.1.0"
 edition = "2024"
+publish = false
 
 [dependencies]
 miette = { version = "7.6.0", features = ["fancy"] }