- Introduce tertiary nav in the participants page

* Specify which close button is being clicked
* Fill out course field when creating a group event

When debug_footer_html() was split from standard_footer_html()
in MDL-71965 the $SCRIPT global declaration was left behind.

This just moves it wherever it's needed.

Data providers are executed at the beginning of the execution
of the phpunit run, not when the test is run.

So, setting anything on them being dependent of current time
has high chances or fail when the test is executed (maybe some
hours later in slow databases / systems).

Data provider only can contain the relative values and then,
when the test is effectively run, they are applied to *current* time.

Some columns in the database have already 29 characters, so we
cannot use a prefix of 3 characters because that puts orcle over
the 30 characters max.