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Remove the usage of `TriggerFlags.XYZSlice.signatures` in the menu
generation. The only hook to modify the list of signatures externally is
the `setChainFilter` method. So there is no need to even expose the list
of signatures outside the `TriggerMenuMT` package via flags:

- Introduce `ChainStore` class/dict that holds the list of chains per
  signature. Also takes care of only allowing a fixed set of signature
  names.
- `setupMenu()` return a `ChainStore` that is used in `GenerateMenuMT`.
- Adapt `runHLT_standalone.py` to the chain filter changes.

Closes ATR-24201.

Change the `ChainProp` class from `namedtuple` to `dataclass` with some
limited type-checking code (could be replaced once we have an external
type-checker available in LCG).

Also fix bug in the chain group assignment of a few chains discovered
by this additional check.

LArPEB chains: change L1EM20VHI seed to L1EM22VHI, move to PhysicsP1 menu, add streamers in Cosmic and PhysicsP1 menu, update references

Vladimir Lyubushkin authored Sep 14, 2021 and Vakhtang Tsulaia committed Sep 14, 2021

B-physics migration of combined dielectron+muon chains, e.g. 'HLT_e9_lhvloose_e5_lhvloose_bBeeM6000_mu4_L1BPH-0M9-EM7-EM5_MU6' (ATR-23839)