[v2] Run service implement `buildInputURI` and `buildRunOutputBase`

[machichima]

We need to implement buildInputURI and buildRunOutputBase to run the whole system end to end

flyte/runs/service/run_service.go

Lines 581 to 591 in ada62dc

	// buildInputURI generates the input URI for the root action
	func buildInputURI(run *models.Run) string {
	// TODO: In production, this should be a real storage path (e.g., s3://bucket/inputs/org/project/domain/run)
	return ""
	}
	// buildRunOutputBase generates the output base path for the run
	func buildRunOutputBase(run *models.Run) string {
	// TODO: In production, this should be a real storage path (e.g., s3://bucket/outputs/org/project/domain/run)
	return ""
	}