[lldb][test] Add the ability to extract the variable value out of the summary. (#72631)

Fix for https://github.com/llvm/llvm-project/issues/71897


When it comes to test infrastructure the test (TestDAP_variables.py:
test_scopes_variables_setVariable_evaluate_with_descriptive_summaries)
will fail if the variable has a summary along with value.

I just tried to add a summary to a variable before we set a value to the
variable using below expression from “request_setVariable” function.
RunLLDBCommands(llvm::StringRef(), {std::string("type summary add
--summary-string "{sample summary}" (const char **) argv")});

As value has nonnumeric characters where we are trying to convert into
integer, python is throwing an error. We did not see this issue in
upstream as we are not adding summary explicitly, by default we are
getting empty summary & value for all children’s of argv parameter (even
after auto summary).

The test is failing with below error:
ERROR:
test_scopes_variables_setVariable_evaluate_with_descriptive_summaries
(TestDAP_variables.TestDAP_variables)
Traceback (most recent call last):
File
"/llvm/llvm-project/lldb/test/API/tools/lldb-dap/variables/TestDAP_variables.py",
line 372, in
test_scopes_variables_setVariable_evaluate_with_descriptive_summaries
enableAutoVariableSummaries=True
File
"/llvm/llvm-project/lldb/test/API/tools/lldb-dap/variables/TestDAP_variables.py",
line 266, in do_test_scopes_variables_setVariable_evaluate
argv = self.get_local_as_int("argv")
File
"//llvm/llvm-project/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/lldbdap_testcase.py",
line 199, in get_local_as_int
return int(value, 16)
ValueError: invalid literal for int() with base 16: '0x0000000000001234
sample summary'
Config=x86_64-//llvm/llvm-build/bin/clang

Co-authored-by: Santhosh Kumar Ellendula <sellendu@hu-sellendu-hyd.qualcomm.com>