Merge pull request #20512 from seamuslee001/php8_contribution_api_tests

CRM/Contribute/BAO/ContributionPage.php

CRM/Contribute/Form/Contribution/Confirm.php

CRM/Core/Payment/AuthorizeNet.php

CRM/Event/BAO/Event.php

...es/message_templates/contribution_online_receipt_html.tpl

...templates/message_templates/event_online_receipt_text.tpl

...s/message_templates/contribution_invoice_receipt_html.tpl

...s/message_templates/contribution_offline_receipt_html.tpl

...s/message_templates/contribution_offline_receipt_text.tpl

...es/message_templates/contribution_online_receipt_html.tpl

...es/message_templates/contribution_online_receipt_text.tpl

...emplates/message_templates/event_offline_receipt_html.tpl

...emplates/message_templates/event_offline_receipt_text.tpl

...templates/message_templates/event_online_receipt_html.tpl

...plates/message_templates/event_online_receipt_subject.tpl

...templates/message_templates/event_online_receipt_text.tpl

...tes/message_templates/event_registration_receipt_html.tpl

...tes/message_templates/event_registration_receipt_text.tpl

...tes/message_templates/membership_offline_receipt_html.tpl

...tes/message_templates/membership_offline_receipt_text.tpl