Remove outdated Mage_Captcha module

[sreichel]

Discussed in #2348

^{Originally posted by addison74 July 30, 2022}
If this module cannot be updated to provide an improved interface (those strings are hard to see on smartphones), but also look primitive for our days, it should be removed from OpenMage.

I have never used it precisely because of the difficult to identify codes. Maybe 14 years ago when Magento 1 was released it was fine, today no way. In addition, in general such checks tend to annoy visitors for spending more time and other safety measures should be taken.

[alexh-swdev]

Will there be a GPDR compliant replacement?