Legacy Page Conversion: Opt-In/Out of Image Captions

Issue Summary

When converting a legacy page the title tage is dropped/lost but the string/data is used to create a caption. Captions are visible on the page where titles are not (only moushover) which may be undesired to have on the page. A User needs to manually delete all the captions after conversion.

Users should be allowed to ...

1. opt out of title tags being converted into captions
2. convert title tags to just title tags or nothing
3. choose if captions are added, and if the data/string comes from title, alt, or custom text

Original Legacy:

<p><ac:image ac:border="true" ac:title="This is the best title tag" ac:alt="This is the best alt tag" ac:height="250" ac:width="553"><ri:attachment ri:filename="celestial-bodies.jpg" ri:version-at-save="1" /></ac:image></p>

Converted:

<ac:image ac:align="left" ac:layout="align-start" ac:original-height="579" ac:original-width="1280" ac:alt="This is the best alt tag" ac:width="550"><ri:attachment ri:filename="celestial-bodies.jpg" ri:version-at-save="1" /><ac:caption>
<p>This is the best title tag</p></ac:caption></ac:image>

Steps to Reproduce
Create a page in legacy editor
Add a title tag

Expected Results
Title tag is retained

Actual Results
Title tag is removed/lost and the string/data is used to create a caption. Which is visible on the page where as a title is only visible on mousehover

Workaround

Manually edit the page after conversion and delete the caption. You can't currently add a tittle tag but there is as seperate feature request for that:
https://jira.atlassian.com/browse/CONFCLOUD-71378