add support for overwriting existing card

[StefanVukovic99]

Implements part of #578

[github-actions]

✔️ No visual differences introduced by this PR.

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[StefanVukovic99]

This basically works now, but it's a full overwrite of all the fields. I think that covers some use cases by itself, like fixing audio and updating from JMdict to jitendex, so should we clean this up and do the per-field settings in a separate PR?
Context:

with the "Mode" determining whether the field should be:

1. skipped (for fields that may be manually changed, e.g. picture)
2. appended to (e.g. allows gathering example sentences)
3. overwritten with the newest version.

[StefanVukovic99]

I think this is good to go

[Kuuuube]

Are you able to test/check if this works on ankiconnect android? Not a blocker but just so we know what to expect.

[StefanVukovic99]

Not easily, I've never tested anything on mobile

[Kuuuube]

Looks like when there are multiple duplicate cards it just picks the first one to overwrite. Might be good to make it clear to users in some way which card is being overwritten.

[Kuuuube]

Looked over everything and tested all cases of the Duplicate card scope and When a duplicate is detected.

The only problem I found is when the model of the duplicate note and the selected anki note model don't match and the duplicate note is in the same deck, attempting to overwrite does nothing. The button should probably be grayed out for this.

[Kuuuube]

Approving despite the previously mentioned issue.

It isn't reasonable to pull the existing duplicate notes from anki to check their model and could lead to big slowdowns in the anki buttons appearing if it pulls notes that have a lot of media.

[jamesmaa]

I'm really not a fan of the recycle icon because it's so overloaded with semantics. It could mean recycle, reset. I feel like the semantic "overwrite" wouldn't show up in people's vocabulary until like 5 definitions down.

I'm going to mark this as non-blocking since we can change it in the future.