Fix partial logs loss in step operators with immutable FS in the backend

Describe changes

I fixed the logs merging logic for immutable File Systems running under the step operator to achieve a smooth user experience and full logs availability.

The root cause was:

If the step is using Step Operator at first a few logs are produced in the triggering environment (client env), and they are dumped to buffer or to the storage
Next the job inside the step operator is triggered and it produces some logs during execution. On logging context exit it merges the log files -> here was the first issue. Static merge file name (full_log.log) was used, see below why this is an issue.
Next we return to client env to finish up the step. Some more logs are produced and on exit merged -> here the issue shines. We first get the list of files and dump them to the merged file (full_log.log) and later clean up the original files (and it includes the full_log.log since it was already produced as part of the step operator). So in the end, no log files are left behind.

On top, there was a side issue with a sequence of log messages since the portion of the first log (generated in client env) is not necessarily dumped to the storage, so it might be living in the buffer, resulting in logs like this:

This is the message from inside the step op #1
This is the message from inside the step op #2
This is the pre-message from the client <---- THIS SHOULD BE THE VERY FIRST LINE
This is the post-message from the client

This is also fixed by force-dumping the logs in all step ops before actually spinning up the job.

Test run: runs/2148df43-456c-440d-8e3d-72f3960e95e0 in Internal

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Types of changes

[x] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)
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zenml-io / zenml