Bug fix: [repo-tools] generate-patch adds incompatible locator (#29046)

* fix: Only encode the version for yarn patches

Signed-off-by: Jack Palmer <jackpalmer@spotify.com>

* chore: changeset

Signed-off-by: Jack Palmer <jackpalmer@spotify.com>

---------

Signed-off-by: Jack Palmer <jackpalmer@spotify.com>

.changeset/silly-taxis-suffer.md

@@ -0,0 +1,5 @@
+---
+'@backstage/repo-tools': patch
+---
+
+Fix issue where generate-patch incorrectly encodes the locator not aligning with result of yarn patch

packages/repo-tools/src/commands/generate-patch/generate-patch.ts

@@ -254,12 +254,7 @@ async function generatePatch(
   await fs.writeFile(joinPath(patchDir, name), patch, 'utf8');
 
   const locator = `${ctx.sourcePkg.packageJson.name}@npm:${version}`;
-  return `patch:${encodeURIComponent(locator)}#${posix.join(
-    '.',
-    '.yarn',
-    'patches',
-    name,
-  )}`;
+  return `patch:${locator}#${posix.join('.', '.yarn', 'patches', name)}`;
 }
 
 // Check if an existing resolution entry is a patch, and in that case return the