RSDK-9721: Improve firstRun error message for missing meta.json. #17648

Job	Run time
static-ignore-tests	0s
appimage-ignore-tests	0s
macos / build	3m 9s
license_finder / Audit 3rd-Party Licenses	1m 15s
test / linux-amd64 Go Unit Tests	15m 0s
test / linux-arm64 Go Unit Tests	14m 49s
test / Test meta.json jsonschema	22s
test / Go 32-bit Unit Tests	10m 40s
test / Test Longer-running Motion Plans if affected / Check files	6s
test / Test Longer-running Motion Plans if affected / Motion Extended Tests	0s
test / All Tests Passing	1s
appimage	0s
static	0s
droid / droid-build	0s
	45m 22s

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