New 2025 Charm changes for June TS

This MR is meant to collect new HLT2 charm changes after the deadline of April 14th as continuation of !4720 (merged)

The deadline for this MR is set June 12th, 2025.

Contributing

If you want to contribute to this MR, please open a new MR and target the charm_opt_2025 branch and explain your goals.

All the additions need to be tested locally, including the impact on the bandwidth and rate: previous and new rates and bandwidths, respectively.

Do not rebase or force-push to this branch without the consent of the liaisons @yingl @aanelli and @cacochat, since this might lead to losses on the changes