[build] Split Rakefile into per-language task files (#16979)

* [build] Split Rakefile into per-language task files

* Run rubocop on Rakefile and rake_tasks

Author: titusfortner

.github/workflows/pre-release.yml

@@ -112,7 +112,7 @@ jobs:
           - name: browsers
             run: ./go update_browsers ${{ inputs.chrome_channel }}
           - name: devtools
-            run: ./go all:update_cdp ${{ inputs.chrome_channel }}
+            run: ./go update_cdp ${{ inputs.chrome_channel }}
           - name: manager
             run: ./go update_manager
           - name: dependencies

BUILD.bazel

@@ -25,7 +25,7 @@ filegroup(
     name = "rakefile",
     srcs = [
         "Rakefile",
-    ],
+    ] + glob(["rake_tasks/*.rake", "rake_tasks/*.rb"]),
     visibility = ["//rb:__subpackages__"],
 )