Keep "EntityFile" records until after Symfony "delete" hooks fire

[christianwach]

Overview

New approach to solving a small part of problems raised in this Lab issue.

Replaces #22994

[civibot]

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[JoeMurray]

@monishdeb could you review?

[monishdeb]

. * General standards
* (r-explain) PASS
* (r-doc) PASS
* (r-run) PASS: Tested on local, looks good.
* (r-tech) PASS
* (r-code) PASS : I agree with the patch and moving the order of the CRM_Core_BAO_EntityTag::del fn
* (r-maint) PASS
* (r-test) PASS