Remove tests and helpers that try to setup / teardown and env var for the tests

Author: cderv

tests/docs/knitr/rscript-args.qmd

@@ -191,16 +191,3 @@ export function quartoDevCmd(): string {
   return Deno.build.os === "windows" ? "quarto.cmd" : "quarto";
 }
 
-export function setEnvVar(name: string, value: string): string | undefined {
-  const originalValue = Deno.env.get(name);
-  Deno.env.set(name, value);
-  return originalValue;
-}
-
-export function restoreEnvVar(name: string, originalValue: string | undefined): void {
-  if (originalValue !== undefined) {
-    Deno.env.set(name, originalValue);
-  } else {
-    Deno.env.delete(name);
-  }
-}