fix: change killall to pkill (#15840)
fix: change killall to pkill (#15840)

It's better to use name to kill the clangd process as it may not be always available at /opt/llvm/bin/clangd .

When using VSCode remote-ssh debug the clangd will be at /home/ubuntu/.vscode-server/data/User/globalStorage/llvm-vs-code-extensions.vscode-clangd/install/11.0.0/clangd_11.0.0/bin/clangd

Signed-off-by: Ameen Rashad <ed5bb2337d356b2086b60737e586b9188c55081e@datafilabs.com>
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