feat: add the prepare plugin hook

BREAKING CHANGE: Committing or creating files in the `publish` plugin hook is not supported anymore and now must be done in the `prepare` hook

Plugins with a `publish` hook that makes a commit or create a file that can be committed must use the `prepare` hook.

lib/git.js

@@ -115,22 +115,6 @@ async function push(origin, branch) {
   await execa('git', ['push', '--tags', origin, `HEAD:${branch}`]);
 }
 
-/**
- * Delete a tag locally and remotely.
- *
- * @param {String} origin The remote repository URL.
- * @param {String} tagName The tag name to delete.
- */
-async function deleteTag(origin, tagName) {
-  // Delete the local tag
-  let shell = await execa('git', ['tag', '-d', tagName], {reject: false});
-  debug('delete local tag', shell);
-
-  // Delete the tag remotely
-  shell = await execa('git', ['push', '--delete', origin, tagName], {reject: false});
-  debug('delete remote tag', shell);
-}
-
 /**
  * Verify a tag name is a valid Git reference.
  *
@@ -157,6 +141,5 @@ module.exports = {
   verifyAuth,
   tag,
   push,
-  deleteTag,
   verifyTagName,
 };