Update logic to identify Swarming task

[jardondiego]

In order to actually identify Swarming tasks, we will look at the job configuration for a flag IS_SWARMING_TASK.

[javanlacerda]

Question: This is the logic that runs inside the swarming machine it self right? Not the logic that schedules a swarming job.

[jardondiego]

Question: This is the logic that runs inside the swarming machine it self right? Not the logic that schedules a swarming job.

Yes, but it is also used in several places, when dispatching the task to Swarming it first checks for that condition, as well as used to identify it as a remote task in src/clusterfuzz/_internal/bot/tasks/task_types.py.