Merge remote-tracking branch 'origin/fix_NR_RLC_Config_during_RRCReestablishment' into integration_2025_w46 (!3760)

gNB: modify RLC configuration applied for SRB1 during RRCReestablishment

TS 38.331 clause 5.3.7.4 specifies to apply the configuration defined in
9.2.1 for SRB1 at UE side. This implies that the gNB also has to apply
sn_field_length = 12, but there are no implications on the other RLC
parameters.

As wrong timer values break SRB1 e.g. for long RTT NTN scenarios, this
commit switches to using the RLC timer values provided in the
configuration file. Currently we still set poll_pdu, poll_byte and
max_retx_threshold to the values defined in 9.2.1, but this can be
changed.