[Backport 6.2] fix(region_name): improvre retreving region_name
in nemesis
#9795
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Retrieve
region_name
in a safer way, since in AWS it might not exist or is empty.Follow-up to #9698.
refs: #9492, #9698
Testing
PR pre-checks (self review)
backport
labelsReminders
Add New configuration option and document them (in
sdcm/sct_config.py
)Add unit tests to cover my changes (under
unit-test/
folder)Update the Readme/doc folder relevant to this change (if needed)
(cherry picked from commit 36976cc)
Parent PR: #9791