[BUG] Causalité MetroscopiaCCGT

[helenev-met]

Issue #1 :
The enthalpy at GT exhaust is imposed as BC :
parameter Units.SpecificEnthalpy GT_h_out=1e6;

However, the TET should be the CL. (since the mml3.0 upgrade, it should be a convergence problem anymore).

Issue #2 :
The combustion chamber efficiency is imposed.
parameter Real combustionChamber_eta = 0.9999;

However, it should be calibrated by the flue gases mass flow which is not associated to any parameter on the calibration_diagram.

Need to update the reverse model and calibration Diagram of MetroscopiaCCGT

[pierre-eliep-met]

J'ai pas du tout compris pourquoi tu mentionnais ces PR @helenev-met mais je suis d'accord avec l'issue