[Dependency Scanning] Make GlobalModuleDependenciesCache aware of the current scanning action's target triple

And only resolve cached dependencies that came from scanning actions with the same target triple.

This change means that the `GlobalModuleDependenciesCache` must be configured with a specific target triple for every scannig action, and it will only resolve previously-found dependencies from previous scannig actions using the exact same triple.

Furthermore, the `GlobalModuleDependenciesCache` separately tracks source-file-based module dependencies as those represent main Swift modules of previous scanning actions, and we must be able to resolve those regardless of the target triple.

Resolves rdar://83105455

lib/DependencyScan/DependencyScanningTool.cpp

@@ -118,7 +118,12 @@ void DependencyScanningTool::resetCache() {
 llvm::ErrorOr<std::unique_ptr<CompilerInstance>>
 DependencyScanningTool::initScannerForAction(
     ArrayRef<const char *> Command) {
-  return initCompilerInstanceForScan(Command);
+  auto instanceOrErr = initCompilerInstanceForScan(Command);
+  if (instanceOrErr.getError())
+    return instanceOrErr;
+  SharedCache->configureForTriple((*instanceOrErr)->getInvocation()
+                                  .getLangOptions().Target.str());
+  return instanceOrErr;
 }
 
 llvm::ErrorOr<std::unique_ptr<CompilerInstance>>