Ensure `common-utils` rc snippets end with newlines (#1100)

ensure common-utils rc snippets have line endings

src/common-utils/devcontainer-feature.json

 {
     "id": "common-utils",
-    "version": "2.5.0",
+    "version": "2.5.1",
     "name": "Common Utilities",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/common-utils",
     "description": "Installs a set of common command line utilities, Oh My Zsh!, and sets up a non-root user.",

src/common-utils/scripts/bash_theme_snippet.sh

@@ -41,4 +41,4 @@ if [[ "$TERM" == "xterm" ]]; then
 
     # Append to PROMPT_COMMAND to call precmd before displaying the prompt
     PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND; }precmd"
-fi
+fi
\ No newline at end of file

src/common-utils/scripts/devcontainers.zsh-theme

 # Oh My Zsh! theme - partly inspired by https://github.com/ohmyzsh/ohmyzsh/blob/master/themes/robbyrussell.zsh-theme
 __zsh_prompt() {
     local prompt_username
-    if [ ! -z "${GITHUB_USER}" ]; then 
+    if [ ! -z "${GITHUB_USER}" ]; then
         prompt_username="@${GITHUB_USER}"
     else
         prompt_username="%n"
@@ -42,4 +42,4 @@ if [[ "$TERM" == "xterm" ]]; then
     autoload -Uz add-zsh-hook
     add-zsh-hook preexec preexec
     add-zsh-hook precmd precmd
-fi
+fi
\ No newline at end of file

src/common-utils/scripts/rc_snippet.sh

@@ -16,9 +16,9 @@ fi
 # Set the default git editor if not already set
 if [ -z "$(git config --get core.editor)" ] && [ -z "${GIT_EDITOR}" ]; then
     if  [ "${TERM_PROGRAM}" = "vscode" ]; then
-        if [[ -n $(command -v code-insiders) &&  -z $(command -v code) ]]; then 
+        if [[ -n $(command -v code-insiders) &&  -z $(command -v code) ]]; then
             export GIT_EDITOR="code-insiders --wait"
-        else 
+        else
             export GIT_EDITOR="code --wait"
         fi
     fi