Revert "add a .clang-format file (#9154)" (#9172)

I thought git would be smart enough to understand all the whitespace changes but even with all the flags I know to make it ignore theses it still blows up if there are identical changes on both sides.

I have a solution but it require creating a new commit at the merge base for each conflicting PR and merging it into develop.

I don't think blowing up all PRs is worth for now, maybe if we can coordinate this for V3 let's say.

This reverts commit 0d11331d18.

src/concurrency/LockGuard.cpp

@@ -1,10 +1,17 @@
 #include "LockGuard.h"
 #include "configuration.h"
 
-namespace concurrency {
+namespace concurrency
+{
 
-LockGuard::LockGuard(Lock *lock) : lock(lock) { lock->lock(); }
+LockGuard::LockGuard(Lock *lock) : lock(lock)
+{
+    lock->lock();
+}
 
-LockGuard::~LockGuard() { lock->unlock(); }
+LockGuard::~LockGuard()
+{
+    lock->unlock();
+}
 
 } // namespace concurrency