[RTADPA BW Tests] Add step to BW test to generate spruce-full configuration

In !4810 (merged), the streaming for spruce-full was updated to be like turbospruce. To do so, an extra dummy step is run after HLT2 before sprucing to generate the configuration file. This MR:

• Adds the step so that BW tests reflect production streaming configurations
• Modifies the corresponding bar chart (similar to what was done here) for readability

We would expect an increase to the bandwidth from these changes. A ci-test reports for the full stream

Total rate = 16.89 kHz - change of 1.17 kHz (7.47%) vs. reference. Total bandwidth = 1.05 GB/s - change of 0.09 GB/s (9.04%) vs. reference.

Webpages built at 813c74bf: https://jconnaug-bwtests.web.cern.ch/Moore4864_updatedsprucestreaming/

Latest ci-test: https://lhcbpr-hlt.web.cern.ch/UpgradeRateTest/BandwidthTest_lhcb-2025-patches-mr.182_Moore_hlt2_and_spruce_bandwidth_x86_64_v3-el9-gcc13-opt+g_2025-05-13_19:39:50_+0200/

Requires lhcb-datapkg/PRConfig!552 (merged)