Remove old deprecated class aliases

[colemanw]

Overview

Deletes old unused class aliases that were renamed years ago.

[civibot]

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[yashodha]

@colemanw merging this PR. Thanks!

[christianwach]

@colemanw @yashodha It would have been good to have some warning about this. I've had to update a number of plugins that called CRM_Dedupe_BAO_RuleGroup::getByType() to use API4 instead. If people update to CiviCRM 5.62.x without updating their plugins first, their sites will throw a fatal error and become non-functional.

When aliasing classes, please please overload methods and implement something like _deprecated_function to write something to the logs so that developers are aware of the impending removal of classes and methods.

I'll opened a ticket on Lab since this looks like a regression to me - and there's only a couple of weeks for everyone to get prepared.

[christianwach]

For reference, this is the PR that created the wrapper classes.