[lldb] In python tests, call dumpSessionInfo(). (#188859)
Updates the lldb python test suite to ensure we call dumpSessionInfo()
in the test result's stopTest() method. This will ensure that we get the
session info dumped for all tests, even those that don't have an
explicit call to dumpSessionInfo() in the test case.
Additionally, I updated the lldb-dap test case to mark the '-dap.log' as
a log file, which will be recorded in the test output on failure.
Here is an example test run with a failure:
```
PASS: LLDB (build/bin/clang-arm64) :: test_step (TestDAP_step.TestDAP_step)
FAIL: LLDB (build/bin/clang-arm64) :: test_step_over_inlined_function (TestDAP_step.TestDAP_step)
Log Files:
- build/lldb-test-build.noindex/tools/lldb-dap/step/TestDAP_step/Failure.log
- build/lldb-test-build.noindex/tools/lldb-dap/step/TestDAP_step/Failure-dap.log
======================================================================
FAIL: test_step_over_inlined_function (TestDAP_step.TestDAP_step)
Test stepping over when the program counter is in another file.
----------------------------------------------------------------------
Traceback (most recent call last):
File "llvm-project/lldb/test/API/tools/lldb-dap/step/TestDAP_step.py", line 113, in test_step_over_inlined_function
self.assertFalse(
AssertionError: True is not false : expect path ending with 'main.cpp'.
Config=arm64-build/bin/clang
----------------------------------------------------------------------
Ran 2 tests in 4.849s
```
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