Fix races

Some races where present both in production and test code. This fixes make test-race so we can use it to detect new ones in the future

Summary by CodeRabbit

• New Features
  • Added ExInfo (External Information) reporting system to detect and broadcast chain halt status.
  • Implemented halt chain detection that monitors THORChain mimirs and reports halt states for connected chains.
  • Added configuration support for specifying known THORChain chains in halt chain monitoring.
  • Added environment variable support for signer seed phrase configuration.

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