Update CHANGELOG.md for 10.1.0

CHANGELOG.md

...d/13637-show-account-confirmation-link-in-e-mail-text.yml

...elogs/unreleased/13711-allow-same-period-housekeeping.yml

changelogs/unreleased/14395-upgrade-gitlab-markup.yml

changelogs/unreleased/14553-missing-space-in-log-msg.yml

changelogs/unreleased/18308-escape-characters.yml

changelogs/unreleased/18608-lock-issues.yml

changelogs/unreleased/20049-projects-api-forks.yml

...d/20824-scope-users-to-members-in-group-issuable-list.yml

...elogs/unreleased/21331-improve-confusing-compare-page.yml

...3888-fix-unsubscription-link-for-snippet-notification.yml

...ogs/unreleased/24121_extract_yet_another_users_finder.yml

changelogs/unreleased/26890-fix-default-branches-sorting.yml

...d/31358_decrease_perceived_complexity_threshold_step2.yml

.../31362_decrease_cyclomatic_complexity_threshold_step4.yml

...d-branch-form-should-have-sane-defaults-for-dropdowns.yml

...d/33328-usage-ping-for-gitlab-features-and-components.yml

...sed/33493-attempt-to-link-saml-users-to-ldap-by-email.yml

changelogs/unreleased/34102-online-view-of-artifacts-fe.yml

...ed/34259-project-denial-of-service-via-gitmodules-fix.yml