refactor: add negative TS annotations for m_chainstate_mutex

Co-authored-by: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>

src/validation.cpp

@@ -2821,6 +2821,8 @@ static void LimitValidationInterfaceQueue() LOCKS_EXCLUDED(cs_main) {
 
 bool CChainState::ActivateBestChain(BlockValidationState& state, std::shared_ptr<const CBlock> pblock)
 {
+    AssertLockNotHeld(m_chainstate_mutex);
+
     // Note that while we're often called here from ProcessNewBlock, this is
     // far from a guarantee. Things in the P2P/RPC will often end up calling
     // us in the middle of ProcessNewBlock - do not assume pblock is set
@@ -2950,6 +2952,8 @@ bool CChainState::PreciousBlock(BlockValidationState& state, CBlockIndex* pindex
 
 bool CChainState::InvalidateBlock(BlockValidationState& state, CBlockIndex* pindex)
 {
+    AssertLockNotHeld(m_chainstate_mutex);
+
     // Genesis block can't be invalidated
     assert(pindex);
     if (pindex->nHeight == 0) return false;