fix: consider localnet in check_studio_based_rpc for leader-only mode

[devin-ai-integration]

Fix DXP-710

fix: consider localnet in check_studio_based_rpc for leader-only mode

Summary

This PR fixes the issue where running gltest on localnet with leader_only=True would show a warning "Leader only mode: True (enabled on non-studio network - will have no effect)" and would not actually enable leader-only mode.

Changes:

• Modified check_studio_based_rpc() in gltest_cli/config/types.py to return True for both "studionet" and "localnet" (previously only "studionet")
• Added test case test_check_studio_based_rpc_with_localnet() to verify localnet returns True
• Updated test_check_studio_based_rpc_with_non_studionet() to use testnet_asimov instead of localnet for the negative case
• Updated test_general_config_chain_methods_compatibility() to expect True for localnet

Impact:
This change affects three call sites where check_studio_based_rpc() is used to determine whether to enable leader-only mode:

1. Warning message in gltest_cli/config/plugin.py
2. Leader-only flag in gltest/contracts/contract.py (write operations)
3. Leader-only flag in gltest/contracts/contract_factory.py (deployments)

Review & Testing Checklist for Human

• Test leader-only mode on localnet: Run gltest --leader-only tests/ on localnet and verify:
  • No warning about "enabled on non-studio network" appears
  • Leader-only mode is actually enabled (check logs or behavior)
  • Contracts deploy and execute correctly
• Consider method naming: The method check_studio_based_rpc() now returns True for localnet, which may be semantically confusing. Consider if it should be renamed to something like supports_leader_only_mode() or is_leader_only_network() in a follow-up PR
• Verify no side effects: Confirm there are no other places in the codebase that rely on check_studio_based_rpc() returning False for localnet

Notes

• All existing tests pass (64 tests in gltest_cli, 18 tests in gltest)
• The semantic meaning of "studio-based" has been broadened to include localnet, which may need documentation updates
• Link to Devin run: https://app.devin.ai/sessions/3fd67921e1334f97a3820c113a8c096b
• Requested by: daniel@genlayerlabs.com (@danielrc888)

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