Make it possible to define the root temporary directory for composer

[mshtelma]

Make it possible to define the root temporary directory for composer

What does this PR do?

Checkpoints can become very large, and sometimes the temporary file system doesn't have enough disk space to accommodate them. This PR introduces the ability to use the TMPDIR environment variable to specify the root temporary directory. Additionally, if TMPDIR is not set and the /local_disk0 directory exists, the system will default to using /local_disk0/temp as the temporary directory.

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[dakinggg]

I believe this is already how mkdtemp works? https://docs.python.org/3/library/tempfile.html#tempfile.mkdtemp. The first place it should look to decide the tmpdir folder is whatever is specified by the TMPDIR env var.