Merge branch 'support-string-piwik-website-ids' into 'master'

Adds changelog entry for Matomo string website ID support

See merge request gitlab-org/gitlab-ce!28244

changelogs/unreleased/61606-support-string-piwik-website-ids.yml

+---
+title: "Supports Matomo/Piwik string website ID (\"Protect Track ID\" plugin)"
+merge_request: 28214
+author: DUVERGIER Claude
+type: fixed
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