1.76.0 tag validation, quick charts, security new version, mailchimp new config

What's Changed

• PR HDX-9626 only try to get username if request arg is a valid string by @alexandru-m-g in #6247
• PR HDX-9626 adding test case for mfa by @alexandru-m-g in #6248
• [HDX-9601] update mailchimp configuration by @teodorescuserban in #6243
• [HDX-9579] re-enable hdxckantool by @teodorescuserban in #6210
• HDX-9467 by @aalecs in #6251
• HDX-9618 enforce tag validation & cache approved tags by @ccataalin in #6252
• dev into prod by @danmihaila in #6259

Full Changelog: 1.75.1...1.76.0