Use slice instead of splice and add changelog entry

Use args.slice(1) instead of args.splice(1) to avoid unnecessary
array mutation. Add changelog entry for new env vars and logging.

Author: cderv

news/changelog-1.9.md

@@ -109,6 +109,7 @@ All changes included in 1.9:
 
 ## Projects
 
+- ([#12444](https://github.com/quarto-dev/quarto-cli/pull/12444)): Improve pre/post render script logging with `Running script` prefix and add `QUARTO_PROJECT_SCRIPT_PROGRESS` and `QUARTO_PROJECT_SCRIPT_QUIET` environment variables so scripts can adapt their output.
 - ([#13892](https://github.com/quarto-dev/quarto-cli/issues/13892)): Fix `output-dir: ./` deleting entire project directory. `output-dir` must be a subdirectory of the project directory and check is now better to avoid deleting the project itself when it revolves to the same path.
 
 ### `website`

src/command/render/project.ts

@@ -986,7 +986,7 @@ async function runScripts(
       env["QUARTO_USE_FILE_FOR_PROJECT_OUTPUT_FILES"] = output;
     }
 
-    const result = await handler.run(script, args.splice(1), undefined, {
+    const result = await handler.run(script, args.slice(1), undefined, {
       cwd: projDir,
       stdout: quiet ? "piped" : "inherit",
       env,