[lldb][test] Disable part of TestDAP_module.py on Linux

This test sometimes times out in CI runs:
/usr/bin/python3 /home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=/home/gha/actions-runner/_work/llvm-project/llvm-project/build/./lib --env LLVM_INCLUDE_DIR=/home/gha/actions-runner/_work/llvm-project/llvm-project/build/include --env LLVM_TOOLS_DIR=/home/gha/actions-runner/_work/llvm-project/llvm-project/build/./bin --libcxx-include-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/include/c++/v1 --libcxx-include-target-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/include/x86_64-unknown-linux-gnu/c++/v1 --libcxx-library-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/./lib/x86_64-unknown-linux-gnu --arch x86_64 --build-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/lldb-test-build.noindex --lldb-module-cache-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/gha/actions-runner/_work/llvm-project/llvm-project/build/./bin/lldb --compiler /home/gha/actions-runner/_work/llvm-project/llvm-project/build/./bin/clang --dsymutil /home/gha/actions-runner/_work/llvm-project/llvm-project/build/./bin/dsymutil --make /usr/bin/gmake --llvm-tools-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/./bin --lldb-obj-root /home/gha/actions-runner/_work/llvm-project/llvm-project/build/tools/lldb --lldb-libs-dir /home/gha/actions-runner/_work/llvm-project/llvm-project/build/./lib --cmake-build-type Release /home/gha/actions-runner/_work/llvm-project/llvm-project/lldb/test/API/tools/lldb-dap/module -p TestDAP_module.py
--
Exit Code: -9
Timeout: Reached timeout of 1200 seconds
...

https://github.com/llvm/llvm-project/actions/runs/17940597997/job/51016081497?pr=139293

The logs say that one test passed, but the printed communication logs relate to
that test too. So I can't tell if that one failed or a different part did.

Given that I've had to disable multiple parts of DAP tests before, I'm just going to
skip the whole file. It's not pretty, but it'll save contributors hassle.

See #137660.

lldb/test/API/tools/lldb-dap/module/TestDAP_module.py

@@ -7,7 +7,8 @@ from lldbsuite.test.lldbtest import *
 import lldbdap_testcase
 import re
 
-
+# Flakey in Github CI runs, see https://github.com/llvm/llvm-project/issues/137660.
+@SkipIfLinux
 class TestDAP_module(lldbdap_testcase.DAPTestCaseBase):
     def run_test(self, symbol_basename, expect_debug_info_size):
         program_basename = "a.out.stripped"