Testnet - v1.18.4

This is a Testnet release. It is not recommended for Mainnet Beta.

What's Changed

• v1.18: adds rollout path for chained Merkle shreds (backport of #35076) by @mergify in #35305
• v1.18: Fix - program loading with effective slot at epoch boundary (backport of #35283) by @mergify in #35302
• v1.18: uses struct instead of tuple for Merkle shreds variant (backport of #35303) by @mergify in #35321
• v1.18: splits test_shred_variant_compat into separate test-cases (backport of #35306) by @mergify in #35324
• v1.18: adds Merkle shred variant with retransmitter's signature (backport of #35293) by @mergify in #35357
• v1.18: Add limit to looping in banking-stage (backport of #35342) by @mergify in #35364
• v1.18: Adds more info to panic message in AccountsHashVerifier (backport of #35353) by @mergify in #35359
• v1.18: Purges all bank snapshots after fastboot (backport of #35350) by @mergify in #35379
• v1.18: [clap-v3-utils] Add functions to parse directly from SignerSource (backport of #34678) by @mergify in #35384
• v1.18: Remove unnecessary unwrap from simulate_transaction_unchecked() (backport of #35375) by @mergify in #35397

Full Changelog: v1.18.3...v1.18.4