feat(iota-core, iota-network, iota-types): resolution of validator grpc migration todos

[filipdulic]

Description of change

Please write a summary of your changes and why you made them.

Links to any relevant issues

• Fixes pcool(Wire Format): Per-transaction traffic tallying for ValidatorV2 streaming endpoints #11080
• Fixes pcool(Wire Format): Cap in-flight work per submit_tx request #11109
• Fixes pcool(Wire Format): Return Rejected instead of Err(Status) for per-tx validation failures in submit_tx #11110
• Fixes pcool(Wire Format): Handle stale epoch_store during get_tx_status wait #11111
• Fixes pcool: collect_tx_status_stream should return per-item results on partial stream failure #11180

How the change has been tested

• Basic tests (linting, compilation, formatting, unit/integration tests)
• Patch-specific tests (correctness, functionality coverage)
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

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6 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
apps-backend	Ignored	Preview	Apr 15, 2026 1:02pm
apps-ui-kit	Ignored	Preview	Apr 15, 2026 1:02pm
iota-evm-bridge	Ignored	Preview	Apr 15, 2026 1:02pm
iota-multisig-toolkit	Ignored	Preview	Apr 15, 2026 1:02pm
rebased-explorer	Ignored	Preview	Apr 15, 2026 1:02pm
wallet-dashboard	Ignored	Preview	Apr 15, 2026 1:02pm