[clang-tools-extra] [clangd] Make the --skip-preamble-build option take an enum (PR #229515)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang-tools-extra/clangd/ClangdServer.cpp clang-tools-extra/clangd/ClangdServer.h clang-tools-extra/clangd/tool/ClangdMain.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/ClangdServer.cpp b/clang-tools-extra/clangd/ClangdServer.cpp
index 3d3a851ef..0c4653ee8 100644
--- a/clang-tools-extra/clangd/ClangdServer.cpp
+++ b/clang-tools-extra/clangd/ClangdServer.cpp
@@ -1221,13 +1221,16 @@ void ClangdServer::adjustParseInputs(ParseInputs &Inputs, PathRef File) const {
     return ModulesManager->hasRequiredModules(File);
   };
 
-  Inputs.Opts.SkipPreambleBuild = [&](){
-    switch(SkipPreambleBuild){
+  Inputs.Opts.SkipPreambleBuild = [&]() {
+    switch (SkipPreambleBuild) {
       using enum SkipPreambleBuildPolicy;
 
-      case Never: return false;
-      case Modules: return HasRequiredModules();
-      case Always: return true;
+    case Never:
+      return false;
+    case Modules:
+      return HasRequiredModules();
+    case Always:
+      return true;
     }
   }();
 }

``````````

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https://github.com/llvm/llvm-project/pull/229515