Deprecation warnings on test environment

[CGCUofG]

On Moodle test environment using:
Moodle version 4.5.7+ (Build: 20251121)
Kaltura Media Assignment release 4.5.12024100702
PHP 8.3

the following warnings are showing in Kaltura media assignment grading window:

1. When work is not yet graded in Moodle, from the Kaltura assignment grading window in Moodle.

Invalid event functions defined in \mod_kalvidassign\event\grade_submissions_page_viewed
line 275 of /lib/classes/event/base.php: call to debugging()
line 64 of /mod/kalvidassign/grade_submissions.php: call to core\event\base::create()
user_picture::fields() is deprecated. Please use the \core_user\fields API instead.
line 152 of /lib/classes/output/user_picture.php: call to debugging()
line 865 of /mod/kalvidassign/renderer.php: call to core\output\user_picture::fields()
line 221 of /mod/kalvidassign/grade_submissions.php: call to mod_kalvidassign_renderer->display_submissions_table()

Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/html/moodle45/local/kaltura/locallib.php on line 241
Invalid get_string() identifier: 'grade' or component 'moodle'. Perhaps you are missing $string['grade'] = ''; in lang/en/moodle.php?
line 355 of /lib/classes/string_manager_standard.php: call to debugging()
line 7031 of /lib/moodlelib.php: call to core_string_manager_standard->get_string()
line 369 of /mod/kalvidassign/renderer.php: call to get_string()
line 833 of /lib/table/classes/flexible_table.php: call to submissions_table->col_status()
line 84 of /lib/table/classes/sql_table.php: call to core_table\flexible_table->format_row()
line 227 of /lib/table/classes/sql_table.php: call to core_table\sql_table->build_table()
line 908 of /mod/kalvidassign/renderer.php: call to core_table\sql_table->out()
line 221 of /mod/kalvidassign/grade_submissions.php: call to mod_kalvidassign_renderer->display_submissions_table()

Deprecated: preg_match(): Passing null to parameter #2 ($subject) of type string is deprecated in /var/www/html/moodle45/local/kaltura/locallib.php on line 241

2. Once work has been graded, from the Kaltura assignment grading window:

• Invalid event functions defined in \mod_kalvidassign\event\grade_submissions_page_viewed
  line 275 of /lib/classes/event/base.php: call to debugging()
  line 64 of /mod/kalvidassign/grade_submissions.php: call to core\event\base::create()
  user_picture::fields() is deprecated. Please use the \core_user\fields API instead.
  line 152 of /lib/classes/output/user_picture.php: call to debugging()
  line 865 of /mod/kalvidassign/renderer.php: call to core\output\user_picture::fields()
  line 221 of /mod/kalvidassign/grade_submissions.php: call to mod_kalvidassign_renderer->display_submissions_table()

• Deprecated: Optional parameter $groupfilter declared before required parameter $perpage is implicitly treated as a required parameter in /var/www/html/moodle45/mod/kalvidassign/renderer.php on line 719

Deprecated: Optional parameter $filter declared before required parameter $perpage is implicitly treated as a required parameter in /var/www/html/moodle45/mod/kalvidassign/renderer.php on line 719

[CGCUofG]

#422