Update CHANGELOG.md for 9.3.0

changelogs/unreleased/31998-pipelines-empty-state.yml

...o-is-still-enabled-for-personal-snippet-comments-form.yml

changelogs/unreleased/32118-new-environment-btn-copy.yml

...-yarn-install-in-ci-by-utilizing-inter-pipeline-cache.yml

...tlab-com-ce-administration-environment_variables-html.yml

...elogs/unreleased/32418-make-link-to-self-less-obvious.yml

changelogs/unreleased/32570-project-activity-tab-border.yml

...login-checks-if-password-is-not-provided-for-git-http.yml

changelogs/unreleased/32642_last_commit_id_in_file_api.yml

changelogs/unreleased/32682-skipped-ci-icon.yml

changelogs/unreleased/32720-emoji-spacing.yml

...eleased/32799-remove-no_turbolink-attribute-from-haml.yml

changelogs/unreleased/32807-company-icon.yml

changelogs/unreleased/32832-confidential-issue-overflow.yml

changelogs/unreleased/32851-postgres-min-version.yml

changelogs/unreleased/32955-special-keywords.yml

...ict-resolution-removed-the-newline-in-the-end-of-file.yml

...fli-over-standard-gzip-compression-for-webpack-assets.yml

...elogs/unreleased/33000-tag-list-in-project-create-api.yml

...rectly-addressed-yourself-todo-when-using-unsubscribe.yml