ATR-30147: Low pT electron & muon (& supporting) triggers, ATR-30248: Last Legacy removals (!74737) · Merge requests · atlas / athena · GitLab

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Include new HLT items to the lowMu menu and remove all remaining legacy items.

Clean up of legacy, ATR-30248, is also included.

tagging Trigger Menu coordinators: @lidiaz @gipezzul tagging: @asmaga