Remove TODO_BETA code comments

[seancolsen]

Fixes #3744

Notes

• Three TODO_BETA comments were related to public sharing of tables/explorations. I removed those comment blocks entirely because I'm not sure we'll ever re-implement that, and if we do it'll require more than just a few small changes in those code locations.

• I changed TOOD_BETA to TODO for smaller changes that seem worth doing at some point. If they are changes which should block beta, then I made sure that they are tracked in GitHub issues. For lower-priority changes, I didn't bother to ensure we have GitHub issues to track them. For example get(schema.name) in SchemaSelector.svelte seems okay for now. I tested renaming a schema to see if I could trigger a reactivity bug in the schema selector, and everything seems to function as I'd expect.

• I'm handling the TODO_BETA comment in pageTitleUtils.ts via Fix small problem with schema name in page titles #4074

• @pavish I'd like you to fix the TODO_BETA issue in src/systems/data-explorer/utils.ts. I know I asked you about this on a call months ago. I remember you telling me how to fix it. And I remember it making sense at the time. I'm sorry I never actually made a PR for it. Now I've forgotten. And I did try to figure it out again, but this code is pretty tough to work with. I think it would be faster for you to make this change. Can you please push a commit to this PR to deal with it? I can't tell if there's a regression here, which is why I'd like to handle this before beta.

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• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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