Keysets - handle multiples in DKG.

[GTC6244]

WHAT

Create additional keysets at any epoch.

[Copilot]

Pull request overview

This PR updates test code to use a more specific signing function and enhances observability in the DKG (Distributed Key Generation) system by improving logging and adding key set identifiers to DKG IDs.

• Refactored test_add_second_keyset to use simple_single_sign_with_hd_key instead of sign_with_each_curve_type
• Enhanced DKG ID formatting to include key set identifiers for better tracking
• Improved trace logging in epoch change logic to show key set identifiers

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
rust/lit-node/lit-node/tests/integration/keysets.rs	Replaced multi-curve testing function with single-curve test calls, removed unused variable
rust/lit-node/lit-node/src/tss/dkg/manager.rs	Added key set identifier to epoch_dkg_id format for better DKG operation tracking
rust/lit-node/lit-node/src/tasks/fsm/epoch_change.rs	Enhanced trace logging to display key set identifiers and improved warning messages with context

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