Add deprecation notices to functions inside branches.inc

Author: markrandall

include/branches.inc

@@ -282,6 +282,7 @@ function get_final_release($branch) {
     return null;
 }
 
+#[Deprecated('Use Branches::getBranchBugsEOLDate')]
 function get_branch_bug_eol_date($branch): ?DateTime
 {
     if (isset($GLOBALS['BRANCHES'][$branch]['stable'])) {
@@ -301,6 +302,7 @@ function get_branch_bug_eol_date($branch): ?DateTime
     return $date?->setDate($date->format('Y'), 12, 31);
 }
 
+#[Deprecated('Use Branches::getBranchSecurityEOLDate')]
 function get_branch_security_eol_date($branch): ?DateTime
 {
     if (isset($GLOBALS['BRANCHES'][$branch]['security'])) {
@@ -328,13 +330,15 @@ function get_branch_security_eol_date($branch): ?DateTime
     return $date?->setDate($date->format('Y'), 12, 31);
 }
 
+#[Deprecated('Use Branches::getBranchReleaseDate')]
 function get_branch_release_date($branch): ?DateTime
 {
     $initial = get_initial_release($branch);
 
     return isset($initial['date']) ? new DateTime($initial['date']) : null;
 }
 
+#[Deprecated('Use Branches::getBranchSupportState')]
 function get_branch_support_state($branch) {
     $initial = get_branch_release_date($branch);
     $bug = get_branch_bug_eol_date($branch);