apps: hostmetrics use mute_process_exe_error

[igorpeshansky]

Description

This mutes errors like error reading process executable for pid N (noticed on Windows, but the mute applies to Linux as well), similarly to #372.

Related issue

b/351056461

How has this been tested?

Errors visible before this PR: [build] (direct link)
Errors not visible with this PR: [build] (direct link)

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
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  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.