ref: remove dead get_pr_commits function (#83576)

function was indented improperly and never called

<!-- Describe your PR here. -->

src/sentry_plugins/github/client.py

@@ -25,11 +25,6 @@ def compare_commits(self, repo, start_sha, end_sha):
         # where start sha is oldest and end is most recent
         return self.get(f"/repos/{repo}/compare/{start_sha}...{end_sha}")
 
-    def get_pr_commits(self, repo, num):
-        # see https://developer.github.com/v3/pulls/#list-commits-on-a-pull-request
-        # Max: 250 Commits
-        return self.get(f"/repos/{repo}/pulls/{num}/commits")
-
 
 class GithubPluginClient(GithubPluginClientMixin, AuthApiClient):
     def __init__(self, url=None, auth=None):

src/sentry_plugins/github/plugin.py

@@ -423,21 +423,6 @@ def compare_commits(self, repo, start_sha, end_sha, actor=None):
                 else:
                     return self._format_commits(repo, res["commits"])
 
-        def get_pr_commits(self, repo, number, actor=None):
-            # (not currently used by sentry)
-            if actor is None:
-                raise NotImplementedError("Cannot fetch commits anonymously")
-
-            # use config name because that is kept in sync via webhooks
-            name = repo.config["name"]
-            try:
-                with self.get_client(actor) as client:
-                    res = client.get_pr_commits(name, number)
-            except Exception as e:
-                self.raise_error(e)
-            else:
-                return self._format_commits(repo, res)
-
 
 class GitHubAppsRepositoryProvider(GitHubRepositoryProvider):
     name = "GitHub Apps"