Merge bitcoin/bitcoin#21846: fuzz: Add -fsanitize=integer suppression needed for RPC fuzzer (generateblock)

575792e fuzz: Add -fsanitize=integer suppression needed for RPC fuzzer (practicalswift)

Pull request description:

  Add `-fsanitize=integer` suppression needed for RPC fuzzer (`generateblock`).

  Context: https://github.com/bitcoin-core/qa-assets/pull/59/checks?check_run_id=2494624259

  ```
  miner.cpp:130:21: runtime error: implicit conversion from type 'int64_t' (aka 'long') of value 244763573890 (64-bit, signed) to type 'uint32_t' (aka 'unsigned int') changed the value to 4245405314 (32-bit, unsigned)
      #0 0x56143974eaf3 in BlockAssembler::CreateNewBlock(CScript const&) miner.cpp:130:21
      #1 0x56143993690d in generateblock()::$_4::operator()(RPCHelpMan const&, JSONRPCRequest const&) const rpc/mining.cpp:370:127
  ```

ACKs for top commit:
  practicalswift:
    > review ACK [575792e](bitcoin/bitcoin@575792e), but this function shouldn't be called by the rpc fuzzer, at least not without sanitizing num_blocks
  MarcoFalke:
    review ACK 575792e

Tree-SHA512: c2133d1064bf17df0e7749ef4a0f7664b5c8082040491a1035d39f0c6e5d96997b347ef2354411e285c7f1f973e34515f1c3c88eb3de60fab64ca4d2adf6dd74

Author: MarcoFalke

test/sanitizer_suppressions/ubsan

@@ -85,6 +85,7 @@ implicit-signed-integer-truncation:chain.h
 implicit-signed-integer-truncation:crypto/
 implicit-signed-integer-truncation:cuckoocache.h
 implicit-signed-integer-truncation:leveldb/
+implicit-signed-integer-truncation:miner.cpp
 implicit-signed-integer-truncation:net.cpp
 implicit-signed-integer-truncation:net_processing.cpp
 implicit-signed-integer-truncation:streams.h