[features] Make loader V2 default

[georgemitenkov]

Description

How Has This Been Tested?

Key Areas to Review

Type of Change

• New feature
• Bug fix
• Breaking change
• Performance improvement
• Refactoring
• Dependency update
• Documentation update
• Tests

Which Components or Systems Does This Change Impact?

• Validator Node
• Full Node (API, Indexer, etc.)
• Move/Aptos Virtual Machine
• Aptos Framework
• Aptos CLI/SDK
• Developer Infrastructure
• Move Compiler
• Other (specify)

Checklist

• I have read and followed the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I identified and added all stakeholders and component owners affected by this change as reviewers
• I tested both happy and unhappy path of the functionality
• I have made corresponding changes to the documentation

[trunk-io]

⏱️ 3h 59m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
replay-mainnet / run-replay-verify	2h 2m	🟥
replay-testnet / run-replay-verify	1h 19m	🟥
test-target-determinator	14m	🟩 🟩 ⬜ 🟩
check-dynamic-deps	13m	🟩 🟩 🟩 🟩 🟩
rust-cargo-deny	5m	🟩 🟩 🟩
semgrep/ci	2m	🟩 🟩 🟩 🟩 🟩
general-lints	1m	🟩 🟩 🟩
file_change_determinator	53s	🟩 🟩 ⬜ 🟩
file_change_determinator	51s	🟩 🟩 🟩 🟩
permission-check	13s	🟩 🟩 🟩 🟩 🟩
permission-check	11s	🟩 🟩 🟩 🟩 🟩
permission-check	9s	🟩 🟩 🟩 🟩
determine-test-metadata	8s	🟩
determine-docker-build-metadata	8s	🟩 🟩 🟩 🟩
check-branch-prefix	1s	🟩

_{settings ⋅ feedback ⋅ docs ⋅ learn more about trunk.io}

[georgemitenkov]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• [cleanup] Remove V1 loader #16005
• [features] Make loader V2 default #15976 👈 (View in Graphite)
• [feature] Remove disable publishing in init module #15974
• main

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