Merge branch 'install_37_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_37_STABLE

The earlier CONTRIB plugin versions of the tool (<33.2.0, <34.2.0) were
missing the following columns in the data requests table:
* commentsformat
* dpocommentformat
And the upgrade scripts for the merged tool failed in
Moodle 3.3.8+/3.3.0+ failed to add these columns.
So a site which uses the CONTRIB plugin and eventually upgrading to 3.9
will encounter an error during upgrade because of the missing
dpocommentformat column.

Merge branch 'install_37_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_37_STABLE

Instead of running the site backpack validation every time badges/backpacks.php
page is loaded, an action button has been added to the backpacks with OB set
to 2.0 to let admins running manually this verification when needed.

A more generic method has been added to the API to validate the
backpack connection (for now, there was only one method for
validating current backpack).
Besides, a renderer has been added to display this information
depending on the backpackid.

This site backpack verification is not required so, instead of
running it always here, it will be moved to a separate page to let
admins decide when to check it.

- Reverted changes from MDL-67901

Merge branch 'install_37_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_37_STABLE

This generates a notice, which wasn't seen because the feature works
asynchronously.

Previously, if the RSS feed (extests) was being served locally,
CFG->proxybypass was applied and causing the test to fail (proxy
ignored).

In that exact test we need the configured proxy to be applied
always, because the test is exaclty about detecting the problem
when a wrong proxy is used.

Merge branch 'install_37_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_37_STABLE

Merge branch 'install_37_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_37_STABLE