Send GamepadEvent for gamepads connected at startup #38415

Job	Run time
build (windows-latest)	4m 30s
ci	1m 37s
miri	6m 43s
toml	2m 1s
build (ubuntu-latest)	1m 56s
check-bevy-internal-imports	4s
build (macos-latest)	2m 32s
check-cfg	1m 2s
check-doc	7m 53s
check-missing-examples-in-docs	33s
typos	6s
run-examples-macos-metal	4m 44s
check-missing-features-in-docs	34s
markdownlint	1m 10s
check-compiles	2m 39s
msrv	1m 4s
build-wasm	35s
	39m 43s

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