Bump hint size; clean up naming and references of autocomplete and command input related components.

Summary: The former change solves PC-683, the latter PC-616. Files are moved and symbols renamed to disambiguate the autocomplete used by breadcrumbs from the one used by the command input. This also fixes a bug where the wrong one was being used for Ctrl/Cmd+K following recent build refactors.

Test Plan: Test both autocompletes: the breadcrumbs (like the script selector) and the command input (Ctrl/Cmd+K). They should behave the same.

Reviewers: #engineering, nserrino, michelle, vihang

Reviewed By: #engineering, vihang

JIRA Issues: PC-616, PC-683

Differential Revision: https://phab.corp.pixielabs.ai/D6790

GitOrigin-RevId: f6ba157d0f6e51f80dba4f66620e8b0b4facd96c