[MDL-35080] Detect foreign tables in 2.3.x upgrade, print error and skip - Moodle Tracker

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Testing Instructions:
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1/ install Moodle 2.2 with 'mdl_' prefix
2/ add bogus tables with names: 'mdl_111user', 'mdl_user-bak', 'mdl_userBak'
3/ create with 'mdl_tableview' from any other table such as "create view mdl_tableview as select * from mdl_config"
4/ expected warnings during upgrade to 2.3 or master branch:

Database table with invalid name 'mdl_111user' detected, skipping.

Database table with invalid name 'mdl_user-bak' detected, skipping.

Database table with invalid name 'mdl_userBak' detected, skipping.

Unsupported database table view 'mdl_tableview' detected, skipping.
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1/ install Moodle 2.2 with 'mdl_' prefix 2/ add bogus tables with names: 'mdl_111user', 'mdl_user-bak', 'mdl_userBak' 3/ create with 'mdl_tableview' from any other table such as "create view mdl_tableview as select * from mdl_config" 4/ expected warnings during upgrade to 2.3 or master branch: Database table with invalid name 'mdl_111user' detected, skipping. Database table with invalid name 'mdl_user-bak' detected, skipping. Database table with invalid name 'mdl_userBak' detected, skipping. Unsupported database table view 'mdl_tableview' detected, skipping.
Affected Branches:
MOODLE_23_STABLE, MOODLE_24_STABLE
Fixed Branches:
MOODLE_23_STABLE
Pull from Repository:
git://github.com/skodak/moodle.git
Pull Master Branch:
w36_~~MDL-35080~~_m24_weirdtables
Pull Master Diff URL:
https://github.com/skodak/moodle/compare/master...w36_MDL-35080_m24_weirdtables

It is not allowed to add custom views or tables that are not defined in install.xml, these foreign tables must not use moodle database table prefix.

Some admins and developers ignore this, we need to educate them and for now skip these tables during upgrade to 2.3.x

In the future standalone db diagnostics scripts should detect this and warn admins.