Comment sysvar and builtin lists as deprecated and remove new keys

[jstarry]

Problem

Sysvar and builtin key lists shouldn't be exposed in the public API

Summary of Changes

• Add comment saying that the lists will be deprecated and shouldn't be modified
• Remove recently added sysvar keys from the sysvar list
• Remove overly restrictive sysvar list inclusion test

Fixes #

[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.

[codecov]

Codecov Report

Merging #34365 (4694e77) into master (8c6239c) will increase coverage by 0.0%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #34365   +/-   ##
=======================================
  Coverage    82.0%    82.0%           
=======================================
  Files         819      819           
  Lines      220598   220592    -6     
=======================================
+ Hits       180898   180909   +11     
+ Misses      39700    39683   -17     

[willhickey]

LGTM