Revert Proto: differentiated inactivity tolerance

This MR reverts the following MRs related to differentiated inactivity period:

• !18946 (merged) Proto: update delegate deactivation table with the actual last activity cycle
  • keeps the Proto/Tests: mv update_activity to scenario_activity commit
• !17582 (merged) Proto: differentiated inactivity tolerance
  • keeps the Proto/Tests: get actual list of voters for each voting period commit
  • keeps the Proto: increase a default safety guard for delegation commit [it was addressed in !19134 (merged)]
  • keeps the etherlink/tezt/tests: reset regressions commit [regressions will be reset in this MR]
  • keeps the Proto/Tests: add stake_info to helpers commit
  • keeps the proto/stake_storage: refacto - mv selected distribution in a separate module commit
  • keeps the Proto/Tests: mv is_inactive to scenario_activity commit
• !19127 (merged) Docs/Alpha: update docs with new tolerated inactivity period
  • keeps the Docs/Alpha: improve active delegate section commit
• !19335 (merged) Proto: more precise comparison to determine tolerated inactivity period
• !19295 (closed) Proto/test: test deactivation of low-stake delegate [not merged yet -> close it]

This MR also closes #8045 (closed).

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR