test: stableswap invariant cases

[mrq1911]

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[github-actions]

Crate versions that have been downgraded:

• runtime-integration-tests: v1.25.1 -> v1.23.3
• hydra-dx-math: v8.2.0 -> v8.1.2
• hydradx: v14.0.2 -> v13.1.2
• pallet-asset-registry: v3.3.0 -> v3.2.4
• pallet-bonds: v2.2.4 -> v2.2.3
• pallet-circuit-breaker: v1.1.26 -> v1.1.25
• pallet-claims: v3.4.11 -> v3.4.9
• pallet-collator-rewards: v1.0.9 -> v1.0.8
• pallet-currencies: v3.0.0 -> v2.1.1
• pallet-dca: v1.6.3 -> v1.5.1
• pallet-democracy: v4.3.2 -> v4.3.0
• pallet-duster: v3.2.7 -> v3.2.5
• pallet-dynamic-evm-fee: v1.0.4 -> v1.0.2
• pallet-dynamic-fees: v1.0.5 -> v1.0.4
• pallet-ema-oracle: v1.3.3 -> v1.3.2
• pallet-evm-accounts: v1.2.0 -> v1.1.2
• pallet-evm-accounts-rpc-runtime-api: v1.0.1 -> v1.0.0
• pallet-genesis-history: v2.1.4 -> v2.1.2
• pallet-lbp: v4.8.6 -> v4.8.4
• pallet-liquidity-mining: v4.4.3 -> v4.3.4
• pallet-nft: v7.1.5 -> v7.1.4
• pallet-omnipool: v4.3.6 -> v4.3.2
• pallet-omnipool-liquidity-mining: v2.4.0 -> v2.1.8
• pallet-otc: v2.0.3 -> v2.0.1
• pallet-otc-settlements: v1.0.5 -> v1.0.3
• pallet-referrals: v1.2.7 -> v1.2.5
• pallet-relaychain-info: v0.3.5 -> v0.3.4
• pallet-route-executor: v2.6.2 -> v2.6.0
• pallet-stableswap: v4.0.0 -> v3.6.4
• pallet-staking: v3.1.2 -> v3.1.1
• pallet-transaction-multi-payment: v10.1.3 -> v10.0.4
• pallet-transaction-pause: v1.0.4 -> v1.0.3
• pallet-xyk: v6.6.2 -> v6.4.4
• pallet-xyk-liquidity-mining: v1.3.1 -> v1.1.11
• pallet-evm-precompile-call-permit: v0.1.3 -> v0.1.1
• precompile-utils: v0.1.3 -> v0.1.1
• primitives: v6.1.0 -> v6.0.3
• runtime-mock: v1.0.1 -> v1.0.0
• hydradx-adapters: v1.3.8 -> v1.3.5
• hydradx-runtime: v271.0.0 -> v256.0.0
• module-evm-utility: v2.21.2 -> v2.21.0
• scraper: v1.2.5 -> v1.2.4
• hydradx-traits: v3.9.0 -> v3.5.0
• hydra-dx-build-script-utils: v1.0.4 -> v1.0.3
• test-utils: v1.1.2 -> v1.1.1

Runtime version has been increased.