Consolidate downloading binaries into one script (#4942)

* Consolidate downloading binaries into one script

- Upgrade lens-k8s-proxy to 0.1.5 which allows us to remove the trailing
  slash in KubeAuthProxy

- Consolidate nromalizing arch and os strings

- Remove LensBinary as HelmCli is not just a raw object since it is
  always bundled

- Introduce OnceCell and use it for the binary paths

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Fully remove helmCli, move associated variable to vars

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Fix helm downloading on windows

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Don't download binaries for unsupported windows

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Arch specific paths

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Fix downloading helm on windows

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* rename once-cell file to lazy-initialized

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/common/utils/lazy-initialized.ts

@@ -0,0 +1,35 @@
+/**
+ * Copyright (c) OpenLens Authors. All rights reserved.
+ * Licensed under MIT License. See LICENSE in root directory for more information.
+ */
+
+/**
+ * A OnceCell is an object that wraps some function that produces a value.
+ *
+ * It then only calls the function on the first call to `get()` and returns the
+ * same instance/value on every subsequent call.
+ */
+export interface LazyInitialized<T> {
+  get(): T;
+}
+
+/**
+ * A function to make a `OnceCell<T>`
+ */
+export function lazyInitialized<T>(builder: () => T): LazyInitialized<T> {
+  let value: T | undefined;
+  let called = false;
+
+  return {
+    get() {
+      if (called) {
+        return value;
+      }
+
+      value = builder();
+      called = true;
+
+      return value;
+    },
+  };
+}