Add functions ext version into building log

[wbail]

in the host building process, to prevent lost this information in case of failing before we were able to log the "starting host".

resolves #8511

Issue describing the changes in this PR

resolves #8511

Pull request checklist

• [X] My changes do not require documentation changes
  • [ ] Otherwise: Documentation issue linked to PR
• [X] My changes should not be added to the release notes for the next release
  • [ ] Otherwise: I've added my notes to release_notes.md
• [X] My changes do not need to be backported to a previous version
  • [ ] Otherwise: Backport tracked by issue/PR #issue_or_pr
• [X] My changes do not require diagnostic events changes
  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• [X] I have added all required tests (Unit tests, E2E tests)

[net-foundation-cla[bot]]

All CLA requirements met.

[wbail]

/azp run

[azure-pipelines[bot]]

Commenter does not have sufficient privileges for PR 8593 in repo Azure/azure-functions-host

[mathewc]

These changes were merged as part of https://github.com/Azure/azure-functions-host/pull/8705. Thanks!