Testnet - v1.18.3

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

What's Changed

• Bump version to v1.18.3 by @yihau in #35206
• v1.18: Report lost_insertions metrics correctly (backport of #35191) by @mergify in #35199
• v1.18: Refactor - LoadedPrograms::replenish() (backport of #35145) by @mergify in #35197
• v1.18: Cleanup - disable_bpf_loader_instructions (backport of #35164) by @mergify in #35209
• v1.18: replay: reload tower if set-identity during startup (backport of #35173) by @mergify in #35257
• v1.18: chains Merkle shreds in broadcast fake shreds (backport of #35061) by @mergify in #35253
• v1.18: validator: include waited_for_supermajority in startup metric (backport of #35137) by @mergify in #35277
• v1.18: validator: ignore too old tower error (backport of #35229) by @mergify in #35279
• v1.18: chains Merkle shreds in fail-entry-verification broadcast (backport of #35060) by @mergify in #35270
• v1.18: uses Merkle shreds in broadcast duplicates (backport of #35115) by @mergify in #35290
• v1.18: chains Merkle shreds in broadcast duplicates (backport of #35058) by @mergify in #35292

Full Changelog: v1.18.2...v1.18.3