[bugfix] process account delete synchronously to prevent OOM (#4260)

# Description

- updates account delete processing to handle side-effects synchronously to prevent OOM
- updates account delete processing to check more often if account.IsLocal() for certain deletes / side-effects
- ensures that mutes get removed from database on delete

## Checklist

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [ ] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [ ] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4260
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

internal/processing/account/export.go

@@ -120,7 +120,7 @@ func (p *Processor) ExportBlocks(
 	ctx context.Context,
 	requester *gtsmodel.Account,
 ) ([][]string, gtserror.WithCode) {
-	blocks, err := p.state.DB.GetAccountBlocks(ctx, requester.ID, nil)
+	blocks, err := p.state.DB.GetAccountBlocking(ctx, requester.ID, nil)
 	if err != nil && !errors.Is(err, db.ErrNoEntries) {
 		err = gtserror.Newf("db error getting blocks: %w", err)
 		return nil, gtserror.NewErrorInternalError(err)