fix(telemetry): fix Clang unused-variable and incomplete-type errors

- Add [[maybe_unused]] to RAII spans in TxQ.cpp
- Include Telemetry.h in RCLConsensus.cpp for complete type

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/xrpld/app/consensus/RCLConsensus.cpp

@@ -63,6 +63,7 @@
 #include <xrpl/shamap/SHAMapItem.h>
 #include <xrpl/shamap/SHAMapMissingNode.h>
 #include <xrpl/shamap/SHAMapTreeNode.h>
+#include <xrpl/telemetry/Telemetry.h>
 #include <xrpl/telemetry/TraceContextPropagator.h>
 
 #include <boost/smart_ptr/intrusive_ptr.hpp>

src/xrpld/app/misc/detail/TxQ.cpp

@@ -532,7 +532,7 @@ TxQ::tryClearAccountQueueUpThruTx(
     beast::Journal j)
 {
     using namespace telemetry;
-    auto span = SpanGuard::span(
+    [[maybe_unused]] auto span = SpanGuard::span(
         TraceCategory::Transactions, txq_span::prefix::txq, txq_span::op::batchClear);
 
     SeqProxy const tSeqProx{tx.getSeqProxy()};
@@ -1681,7 +1681,7 @@ TxQ::tryDirectApply(
     beast::Journal j)
 {
     using namespace telemetry;
-    auto span = SpanGuard::span(
+    [[maybe_unused]] auto span = SpanGuard::span(
         TraceCategory::Transactions, txq_span::prefix::txq, txq_span::op::applyDirect);
 
     auto const account = (*tx)[sfAccount];