consider improving some TOCTOU subtleties

[ee7]

For example, if a user:

1. Runs configlet sync -u --tests -e foo
2. Waits at the prompt
3. Changes the tests.toml file for exercise foo in their track directory, e.g. adding include = false to a test.
4. Continues going through configlet prompts until completion

If I recall correctly, configlet sync still works, and ignores that the file was changed. We could document this, or consider producing a warning if the file was modified since read-time. But it's probably tricky (and not worth trying) to support arbitrary changes to a file that we're asking questions about.

[kotp]

TOCTOU

Tme Of Check to Time Of Use

[ErikSchierboom]

But it's probably tricky (and not worth trying) to support arbitrary changes to a file that we're asking questions about.

I'd happily not consider this edge case at all. If people are running configlet to update files, and then start editing those files whilst doing that, I don't think we need to detect that in order to provide "sane" behavior.