Revert "Reapply "[llvm]Add a simple Telemetry framework" (#120769) (#121003)"

This reverts commit dbae717.

Author: oontvoo

llvm/docs/Telemetry.rst

@@ -72,7 +72,6 @@ intermediate LLVM representation.
    SupportLibrary
    TableGen/index
    TableGenFundamentals
-   Telemetry
    Vectorizers
    WritingAnLLVMPass
    WritingAnLLVMNewPMPass
@@ -294,6 +293,3 @@ Additional Topics
 
 :doc:`Sandbox IR <SandboxIR>`
    This document describes the design and usage of Sandbox IR, a transactional layer over LLVM IR.
-
-:doc:`Telemetry`
-   This document describes the Telemetry framework in LLVM.