[Debuginfo][NFC] Remove usages of WithColor::error and WithColor::warning.

Summary:
This patch is extracted from D74308.

It patches all usages of WithColor::error() and WithColor::warning
in DebugInfoDWARF library.

Depends on D74481

Reviewers: jhenderson, dblaikie, probinson, aprantl, JDevlieghere

Reviewed By: JDevlieghere

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D74635