Feature gate is_builtin when checking for account executable

[HaoranYi]

Problem

Feature gate is_builtin when checking for account executable

Summary of Changes

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.

[HaoranYi]

We no longer need this fix because we have reverted deprecating executable feature from v1.18.
#337