Default encoding for I/O operations should be UTF-8

[t1m0thyj]

Whenever open() is called to open a file, we want to use UTF-8 encoding so that special characters are supported.
The default encoding on Windows is currently CP-1252 (until PEP 686 gets implemented in Python 3.15).

To fix this, we should pass encoding="utf-8" on all open() calls unless the file is opened in binary mode.
For example, the following places should be changed in order to support special characters in z/OS job spool files:

zowe-client-python-sdk/src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py

Line 399 in 8c9580a

_out_file = open(_output_file, "w")

zowe-client-python-sdk/src/zos_jobs/zowe/zos_jobs_for_zowe_sdk/jobs.py

Line 414 in 8c9580a

_out_file = open(_output_file, "w")

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