[Preset] Add Linux preset for XCTest pull request testing

Author: shahmishal

utils/build-presets.ini

@@ -1694,6 +1694,40 @@ assertions
 indexstore-db
 sourcekit-lsp
 
+#===------------------------------------------------------------------------===#
+# Test Swift Corelibs XCTest
+#===------------------------------------------------------------------------===#
+
+[preset: buildbot_xctest_linux]
+libicu
+llbuild
+swiftpm
+xctest
+foundation
+libdispatch
+indexstore-db
+sourcekit-lsp
+
+release
+validation-test
+reconfigure
+
+install-foundation
+install-libdispatch
+install-libicu
+install-libcxx
+install-swift
+install-llbuild
+install-swiftpm
+install-xctest
+install-indexstore-db
+install-sourcekit-lsp
+
+skip-test-cmark
+skip-test-swift
+skip-test-libdispatch
+skip-test-foundation
+
 #===------------------------------------------------------------------------===#
 # Remote Mirror Library
 #===------------------------------------------------------------------------===#