feat(Prometheus): New metric: `build_info`

[nlamirault]

Checklist:

• [x] Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• [x] The title of the PR states what changed and the related issues number (used for the release note).
• [x] The title of the PR conforms to the Toolchain Guide
• [x] I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• [ ] I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• [ ] Does this PR require documentation updates?
• [ ] I've updated documentation as required by this PR.
• [x] I have signed off all my commits as required by DCO
• [ ] I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• [ ] My build is green (troubleshooting builds).
• [ ] My new feature complies with the feature status guidelines.
• [ ] I have added a brief description of why this PR is necessary and/or what this PR solves.
• [ ] Optional. My organization is added to USERS.md.
• [ ] Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 45.69%. Comparing base (600737a) to head (477fd38). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #17186      +/-   ##
==========================================
+ Coverage   45.68%   45.69%   +0.01%     
==========================================
  Files         353      353              
  Lines       46965    46970       +5     
==========================================
+ Hits        21454    21461       +7     
+ Misses      22772    22771       -1     
+ Partials     2739     2738       -1     

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[ilia-medvedev]

LGTM, maybe we should cover it with unit test though