Update fslrt dev chain to jJ160 and remove unneeded dev chains

Benjamin Kerridgerequested to merge
bkerridg/athena:bk-atr30720 into 24.0

Remove the 4J15, XE50 and L1All chains as they are not used. Update HLT_fslrt0_L1J100 to use jJ160 as this chain is used in validation tests. Also removing HLT_isotrk50_L1XE50

Jira: ATR-30720

Edited by Benjamin Kerridge

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