feat: reduce jug_xl size

Current top consumers:

102M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/openblas-0.3.23-u6gyyig6l5qjtzk2n6zjcrcveuuchntz
114M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/pythia8-8.309-rtwmotkcpzgfunpv5xolqoxrnhzhts27
128M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/g4realsurface-2.2-k5unpiedhwih7vgplcot6wt33bthlqaz
129M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/emacs-28.2-uvyppn37kppxzcda3v5dkmwolwxjxjhv
140M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/py-pandas-1.5.3-n3j6vflbwhp2xpa5yo73etfi56yljgqw
176M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/gdb-12.1-jvxvoqz6rfaqf4sjeryh6zq4jsoj2wrt
177M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/python-3.10.10-kku67ntleksxlc33mzdcddff2pwsp5z3
186M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/opencascade-7.7.1-xzhlq75nvpzhlzlfl7ux3e3izbcu6cr7
188M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/boost-1.82.0-52hnlpxsrir4ac7lhd6znsxnscwfcvvg
263M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/geant4-11.1.1-tqym7jfg2aaogeeopwcswytblwq4j45r
317M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/qt-5.15.9-yyzwpqgarhuy7wvf3tunm6pqezy3ju2u
456M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/root-6.26.10-7i6p6kdizdtyfknsclk32hqfcoz7idz3
474M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/cernlib-2022.11.08.0-free-qlpsgb7e4woayoanklmd455vznvvl77v
531M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/rust-1.65.0-q47cpey64qy4ui4dtby6ak7hzalphpfx
624M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/g4emlow-8.2-ojkfof6lenbvzlzibggxcgi7d3b3bkzr
734M    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/git-2.40.0-lm6wj2iisvsih6mse47tefnejuavnh62
1.1G    /opt/software/linux-debian12-x86_64_v2/gcc-12.2.0/g4ndl-4.7-d6jny6mgrngsirppm3rqsxvrhkw326qt

• remove emacs, !677 (closed)
• rust not needed as runtime dependency, !681 (merged)
• cernlib doesn't need both shared and static, https://github.com/spack/spack/pull/39406, !685 (merged)
• git hard links are resolved, !678 (merged)
• g4ndl unneeded, https://github.com/spack/spack/pull/39396, !691 (merged)