Stop overriding GitHubStatusPush's default generators

The explicit `generators=[BuildStartEndStatusGenerator(...)]` here dropped
buildbot's own default `BuildRequestGenerator`, which posts a "pending"
GitHub status as soon as a build is queued. Without it, a builder has no
status at all until a worker actually starts it, so PRs could look
all-green while several buildbots hadn't begun -- and merges landed before
the builders ever ran. The `context=` override was also identical to the
library default. Removing both restores the queued-state status and
trims config that no longer needs to exist.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: alexreinking

master/master.cfg

@@ -17,9 +17,7 @@ from buildbot.config import BuilderConfig
 from buildbot.locks import WorkerLock
 from buildbot.process.factory import BuildFactory
 from buildbot.process.properties import Interpolate, Properties, Property, Transform, renderer
-from buildbot.reporters.generators.build import BuildStartEndStatusGenerator
 from buildbot.reporters.github import GitHubStatusPush
-from buildbot.reporters.message import MessageFormatterRenderable
 from buildbot.schedulers.basic import AnyBranchScheduler
 from buildbot.schedulers.canceller import OldBuildCanceller
 from buildbot.schedulers.forcesched import ForceScheduler
@@ -1281,14 +1279,6 @@ c["logCompressionMethod"] = "zstd"
 c["services"] = [
     GitHubStatusPush(
         token=GITHUB_TOKEN,
-        context=Interpolate("buildbot/%(prop:buildername)s"),
-        generators=[
-            BuildStartEndStatusGenerator(
-                builders=[b.name for b in c["builders"]],
-                start_formatter=MessageFormatterRenderable("Build started."),
-                end_formatter=MessageFormatterRenderable("Build done."),
-            )
-        ],
         verbose=True,
     ),
     OldBuildCanceller(