[lldb-dap] Fix links to LLVM issue tracked and pull requests

Currently, the link to the issue tracker takes you to the Github source
repository, rather than the Github issue tracker. This fixes the link
and includes the lldb-dap label in both the issue and PR URL.

Author: JDevlieghere

lldb/tools/lldb-dap/README.md

@@ -324,8 +324,8 @@ API for handling a custom event from an extension.
 ## Contributing
 
 `lldb-dap` and `lldb` are developed under the umbrella of the [LLVM project](https://llvm.org/).
-The source code is [part of the LLVM repository](https://github.com/llvm/llvm-project/tree/main/lldb/tools/lldb-dap) on Github.
-We use Github's [issue tracker](https://github.com/llvm/llvm-project/tree/main/lldb/tools/lldb-dap) and patches can be submitted via [pull requests](https://github.com/llvm/llvm-project/pulls).
+The source code is part of the [LLVM repository](https://github.com/llvm/llvm-project/tree/main/lldb/tools/lldb-dap) on Github.
+We use Github's [issue tracker](https://github.com/llvm/llvm-project/issues?q=label%3Alldb-dap) and patches can be submitted via [pull requests](https://github.com/llvm/llvm-project/pulls?q=label%3Alldb-dap).
 Furthermore, there is a [LLDB category](https://discourse.llvm.org/c/subprojects/lldb/8) on the LLVM discourse forum.
 
 For instructions on how to get started with development on lldb-dap, see the "[Contributing to lldb-dap](https://lldb.llvm.org/resources/lldbdap.html)"