Name every Bencher workflow

Give each example workflow a top-level name that matches the GitHub
Actions how-to, so runs are easy to tell apart in the Actions tab.

Author: epompeii

.github/workflows/base_benchmarks.yml

@@ -1,3 +1,5 @@
+name: Base Branch Benchmarks with Bencher
+
 on:
   push:
     branches: main

.github/workflows/fork_pr_benchmarks_closed.yml

@@ -1,3 +1,5 @@
+name: Archive Closed Fork PR Branch with Bencher
+
 on:
   pull_request_target:
     types: [closed]

.github/workflows/pr_bare_metal_benchmarks.yml

@@ -1,3 +1,5 @@
+name: Bare Metal PR Benchmarks with Bencher
+
 on:
   pull_request:
     types: [opened, reopened, edited, synchronize]

.github/workflows/pr_bare_metal_benchmarks_attach.yml

@@ -1,3 +1,5 @@
+name: Attach Bare Metal PR Benchmarks with Bencher
+
 on:
   repository_dispatch:
     types: [bencher_run]

.github/workflows/pr_benchmarks.yml

@@ -1,3 +1,5 @@
+name: PR Benchmarks with Bencher
+
 on:
   pull_request:
     types: [opened, reopened, edited, synchronize]

.github/workflows/pr_benchmarks_closed.yml

@@ -1,3 +1,5 @@
+name: Archive Closed PR Branch with Bencher
+
 on:
   pull_request:
     types: [closed]