Executor stdout and stderr should be in their own files

[MattMcL4475]

Use the following naming schema:

task-executor-stdout-1.txt
task-executor-stderr-1.txt
task-executor-stdout-2.txt
task-executor-stderr-2.txt

Currently, the exec_stdout intersperses TES Runner CLI logs with the tool logs themselves. It seems the executors stdout and stderr should be in clean files by themselves. As part of this issue, it seems we should rethink the file names too. It's confusing that stdout.txt is actually the TES runner stdout.txt, and the executor itself doesn't have it's own file.

2024-09-28 20:02:32.741 info: Tes.Runner.Authentication.CredentialsManager[0]
2024-09-28 20:02:35.651 info: Tes.Runner.Events.EventsPublisher[0]
Publishing event executorStart to sink: BlobStorageEventSink
2024-09-28 20:02:35.717 info: Tes.Runner.Docker.DockerExecutor[0]
Pulling image name: ubuntu image tag: 22.04
2024-09-28 20:02:37.130 info: Tes.Runner.Docker.DockerExecutor[0]
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2024-09-28 20:03:15.183 info: Tes.Runner.Events.EventsPublisher[0]
Publishing event executorEnd to sink: BlobStorageEventSink
2024-09-28 20:03:15.201 info: Tes.RunnerCLI.Commands.CommandHandlers[0]
Docker container execution status code: 0

[MattMcL4475]

#427