Make all tests stable

[AMDmi3]

Some snapshot tests are dependent on current time and need to be fixed

• graphs
• log
• link
• orphaned maintainer
• orphaned repository
• orphaned projects

graphs tests are currently ignored as they change frequently, others contain elapsed times in templates, which recently changed from 11 to 12 months (since we use dates from Jan 2024 in test fixtures), will change once again in a month and the will change every year.

To fix these, we'll need to fake current time, probably in both database and the application (however, may consider consolidating it in one place).

• Database recipe is described here.
• Application is a bit more complex, and we cannot just use condition compilation, as tests use library compiled normally. Implementing mock time would need a cascade of changes (which we'll need regardless of this issue):
  • Implement global config, pass it to application constructor, pass it through state to endpoints. Pass a flag to enable test time through the config.
  • Automatically and unconditionally construct template context, take a test time flag from the state.
  • Implement now() in template context.