[lldb][test] Support remote run of Shell tests (#95986) 1. This commit adds LLDB_TEST_PLATFORM_URL, LLDB_TEST_SYSROOT, LLDB_TEST_PLATFORM_WORKING_DIR, LLDB_SHELL_TESTS_DISABLE_REMOTE cmake flags to pass arguments for cross-compilation and remote running of both Shell&API tests. 2. To run Shell tests remotely, it adds 'platform select' and 'platform connect' commands to %lldb substitution. 3. 'remote-linux' feature added to lit to disable tests failing with remote execution. 4. A separate working directory is assigned to each test to avoid conflicts during parallel test execution. 5. Remote Shell testing is run only when LLDB_TEST_SYSROOT is set for building test sources. The recommended compiler for that is Clang. --------- Co-authored-by: Vladimir Vereschaka <vvereschaka@accesssoftek.com>
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