Fix accordion behavior with JQuery interface

To ensure that we don't accidentally use any of the aliases.
This should prevent any future regressions from #12761.
Also updates the test suite since it now can't use these aliases either.

Appears to be unnecessary and is broken by #16011,
which is otherwise quite sane.

Thanks to @peterblazejewicz & @Nikita240
Adds unit tests based on #14417
X-Ref: #14282
Closes #15807

[Fixes #15953] Implement `assert.expect` in each unit test

Fixes #15741
Closes #15751 by merging it.

Refs #15893

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Fixes #13636.

Fixes #14844.
Closes #14845.

Added handling of aria-expanded=true/false to collapse.js, updated
documentation to include advice on making expand/collapse controls
accessible, updated examples and javascript documentation to use
aria-expanded and aria-controls (when targetting single collapsible
element, using ID rather than class selector)

Closes #14147.
Closes #14153.

#11464 - Fix JS noConflict mode - Refactor all plugins to use an internal reference to the jQuery plugin, because in noConflict mode you can never expect to be defined on the jQuery object