Revamp "last updated" metric for projects and judges

[MichaelZhao21]

Describe the feature you'd like

There are two cases that I've personally found that we shouldn't update the "last updated" values for judges/projects

• Hide judge/project (Hide judge should not set their last updated time #87)
• When projects get assigned to judges (because a judge might skip/take a break and the project won't be seen by said judge)

There might be more, so this issue would require exploring everywhere that "last update" is being updated and removing extraneous ones, as well as adding in cases where we need to set this value too. This is a good metric to see inactive judges/not often judged projects, so we should only update this when that resource does something.

Pre-existing Issue or Justification

No response

Additional context

No response