ci: disable slow tests on Appveyor/Windows

[holiman]

Follow-up to #28387, which I found while trying to fix the GOARCH=386 test-runs on appveyor.

This PR disables the long-running tests on windows/appveyor, by using the -short flag to tests. This disables the following statetests:

	st.slow(`^stAttackTest/ContractCreationSpam`)
	st.slow(`^stBadOpcode/badOpcodes`)
	st.slow(`^stPreCompiledContracts/modexp`)
	st.slow(`^stQuadraticComplexityTest/`)
	st.slow(`^stStaticCall/static_Call50000`)
	st.slow(`^stStaticCall/static_Return50000`)
	st.slow(`^stSystemOperationsTest/CallRecursiveBomb`)
	st.slow(`^stTransactionTest/Opcodes_TransactionInit`)

And these blockchain tests:

	// Slow tests
	bt.slow(`.*bcExploitTest/DelegateCallSpam.json`)
	bt.slow(`.*bcExploitTest/ShanghaiLove.json`)
	bt.slow(`.*bcExploitTest/SuicideIssue.json`)
	bt.slow(`.*/bcForkStressTest/`)
	bt.slow(`.*/bcGasPricerTest/RPC_API_Test.json`)
	bt.slow(`.*/bcWalletTest/`)

[holiman]

I (unintentionally) comitted this as part of #28387. Sorry!