ohos: Replace Q_OS_OHOS with Q_OS_HARMONY


qtbase renamed the HarmonyOS platform detection macro from Q_OS_OHOS to
Q_OS_HARMONY. Update all test files that guard QProcess-based tests
for this platform accordingly, and correct the QSKIP message in
tst_integration_external.cpp from "OHOS" to "HarmonyOS" for consistency.

Pick-to: 6.12
Change-Id: I414113f9a0b98d016e4ab9a19068c01db38dd108
Reviewed-by: Liang Qi <liang.qi@qt.io>
commit062faeb0aa8afc48c5391d16abaa1ffc689afb6c
parent560eecc76a37482217b97ee0bff2f201c76f77bb
authorSanthoshKumar Selvaraj <santhosh.kumar.selvaraj@qt.io>
committerSanthoshKumar Selvaraj <santhosh.kumar.selvaraj@qt.io>
commit timeFri, 31 Jul 2026 15:10:50 +0000