Refactor portal hooks

[jacbn]

Refactors the main React portal wrapper to use better use hooks and dependencies in order to:

• Prevent portal code running multiple times unnecessarily;
• Better link the two halves of our portal hooks (modifying the DOM / placing portals) such that portals always link to an extant part of the DOM. This, I believe, forcibly prevents race conditions between portals appearing and the DOM they were meant to point to updating, meaning all the past issues regarding “x portal component not appearing”, “empty div in DOM with no content” should be fixed!!

[codecov]

Codecov Report

❌ Patch coverage is 46.77419% with 99 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.29%. Comparing base (fcb545a) to head (4c46462).

Files with missing lines	Patch %	Lines
...mponents/elements/markup/portals/GlossaryTerms.tsx	34.09%	28 Missing and 1 partial ⚠️
...elements/markup/portals/renderClozeDropRegions.tsx	23.68%	26 Missing and 3 partials ⚠️
.../app/components/elements/markup/portals/Tables.tsx	44.73%	19 Missing and 2 partials ⚠️
.../elements/markup/portals/renderInlineEntryZone.tsx	36.00%	14 Missing and 2 partials ⚠️
src/app/components/elements/markup/index.tsx	82.60%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1981      +/-   ##
==========================================
+ Coverage   43.17%   43.29%   +0.11%     
==========================================
  Files         575      575              
  Lines       24620    24688      +68     
  Branches     8128     8155      +27     
==========================================
+ Hits        10630    10688      +58     
- Misses      13322    13329       +7     
- Partials      668      671       +3     

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[sjd210]

This looks good. Took me some time to figure out how portals actually work in the codebase in the first place, even with the new comments. In fact, we could perhaps do with even more comments, but inside the individual portal hook implementations like Table.tsx has. That's outside of this PR's scope however, so I'll make a separate card.

As for the main changes, I can see how the race condition would come up and it makes sense to me that this would fix it, BUT owing to the inconsistency of reproducing theses portal issues in the first place it's hard to be 100% sure that this was the only/entire problem. I've tested as best I can across each of the different portal types and seen no issues, and I don't see how this could possibly make things worse, so I think at this point we should just merge and wait for issues to come in again or not (🤞)