cli: show max vote credits in vote-account based on TVC activation epoch

[AshwinSekar]

Problem

Show vote account CLI compares the credits earned vs slots in epoch.
This is a faulty comparison as with TVC validators can earn up to 16 credits per slot.

Summary of Changes

Add a multiplier based on whether TVC was active in that epoch for a fair comparison

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.

[mergify]

Backports to the stable branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule.

[mergify]

automerge label removed due to a CI failure