2026-09-01

Exclude the LLVM lit macros from buck2's prelude ci_hints

Summary:
Three `ci_hint` glob lists hint on all of `tools/build_defs/**`, which
covers `tools/build_defs/llvm` -- the LLVM build macros. None of the
hinted tests use them, so editing an LLVM macro pulls in every Apple rule
test, every non-isolated buck2 e2e test, and the sample build jobs.
Exclude to avoid unnecessary broad CI jobs and improve the chances of
relevant ones getting run.

Reviewed By: bcardosolopes

Differential Revision: D117884846

fbshipit-source-id: 267bbe2d041bf93dedd578a3eaf467852e640a33