External Index handling as sent by external chain

[girazoki]

Adds handling of the epoch sent externally as part of the validators. this is used later to pinpoint reward and slashes to a certain point in time. As part of this PR we do:

• store the external index (which can be an epoch/timestamp/set_id or in general whatever you want that acts as an indetifier for the validators sent at a given point in time) per era. Everytime we receive one we put it in storage item called ExternalIndex. Before the era start, we put this in PendingExternalIndex. At the era start, we put it in CurrentExternalIndex.

• on_era_start now sends this timestamp over. The goal is that pallet-external-validator-slashes stores this information in BondedEras. As this is the information later used to pinpoint slahes, we use it to pinpoint a particular slash to a external index.

• externalValidatorsRewards now sends CurrentExternalndex as part of the rewards message.

• Includes a migration to migrate currently bonded eras

To verify it works with try-runtime: try-runtime --runtime target/release/wbuild/dancelight-runtime/dancelight_runtime.compact.compressed.wasm on-runtime-upgrade live --uri wss://stagelight.tanssi-dev.network:443 --pallet ExternalValidatorSlashes --pallet CollatorConfiguration --pallet Balances --pallet Migrations --pallet Configuration

[github-actions]

WASM runtime size check:

Compared to target branch

dancebox runtime: 1412 KB (no changes) ✅

flashbox runtime: 824 KB (no changes) ✅

dancelight runtime: 2172 KB (no changes) ✅

container chain template simple runtime: 1116 KB (no changes) ✅

container chain template frontier runtime: 1404 KB (no changes) ✅

[github-actions]

Coverage Report

(master)

@@                         Coverage Diff                         @@
##           master   girazoki-add-timestamp-handling      +/-   ##
===================================================================
+ Coverage   66.01%                            66.04%   +0.03%     
  Files         335                               335              
+ Lines       58789                             58858      +69     
===================================================================
+ Hits        38809                             38869      +60     
+ Misses      19980                             19989       +9     

Files Changed	Coverage
/chains/orchestrator-paras/runtime/common/src/migrations.rs	85.56% (-0.67%)	❗
/chains/orchestrator-relays/runtime/dancelight/src/lib.rs	68.61% (-0.17%)	❗
/chains/orchestrator-relays/runtime/dancelight/src/tests/migrations_test.rs	99.04% (+1.57%)	✅
/pallets/external-validator-slashes/src/lib.rs	86.25% (+0.22%)	✅
/pallets/external-validators/src/lib.rs	90.85% (+0.41%)	✅
/primitives/bridge/src/symbiotic_message_processor.rs	93.55% (+0.69%)	✅

Coverage generated Fri Jan 31 18:12:41 UTC 2025