Revert reference-types support (backport #2311)

[mergify]

Mostly reverts #2289 (except for the cosmwasm-check CI change).
We have to revert this because wasmer does not support reference types for singlepass yet, so allowing them in the validation can be used to cause a panic while compiling the module.

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This is an automatic backport of pull request #2311 done by Mergify.

[mergify]

Cherry-pick of f04587a has failed:

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Unmerged paths:
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	both added:      .circleci/config.yml
	both added:      CHANGELOG.md
	both added:      Cargo.lock
	both added:      Cargo.toml
	both added:      contracts/burner/Cargo.lock
	both added:      contracts/crypto-verify/Cargo.lock
	both added:      contracts/cyberpunk/Cargo.lock
	both added:      contracts/empty/Cargo.lock
	both added:      contracts/floaty/Cargo.lock
	both added:      contracts/hackatom/Cargo.lock
	both added:      contracts/ibc-callbacks/Cargo.lock
	both added:      contracts/ibc-reflect-send/Cargo.lock
	both added:      contracts/ibc-reflect/Cargo.lock
	both added:      contracts/queue/Cargo.lock
	both added:      contracts/reflect/Cargo.lock
	both added:      contracts/staking/Cargo.lock
	both added:      contracts/virus/Cargo.lock
	both added:      packages/check/Cargo.toml
	both added:      packages/crypto/Cargo.toml
	both added:      packages/go-gen/Cargo.toml
	both added:      packages/schema/Cargo.toml
	both added:      packages/std/Cargo.toml
	both added:      packages/std/src/math/signed_decimal_256.rs
	both added:      packages/vm/Cargo.toml
	both added:      packages/vm/src/calls.rs
	both added:      packages/vm/src/imports.rs
	both added:      packages/vm/src/modules/file_system_cache.rs

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