chore: fix null metadata and annotation json representation

[turip]

Overview

In the DB instead of a NULL field value we end up having a 'null'::jsonb string, which is a pain to handle when it comes to data migrations, as we need to do something like this:

UPDATE billing_invoice_lines
SET
    annotations = CASE
        WHEN annotations IS NULL OR annotations = 'null'::jsonb THEN '{}'::jsonb
        ELSE annotations
    END || jsonb_build_object('billing.subscription.sync.ignore', true)
WHERE
    -- Line type usage based
    "type" = 'usage_based'
    -- Status valid
    AND "status" = 'valid'
    -- InvoiceID belongs to a not gathering invoice
    AND "invoice_id" NOT IN (
        SELECT "id" FROM billing_invoices
        WHERE "status" = 'gathering'
    );

Unfortunately ent has a long known issue around value scanners in mixins: ent/ent#3785

This patch depends on ent/ent#4421 being merged, right now it is just pointed to my fork for testing purposes.

Once it is deployed, I will create a new PR with the migrations to correct the existing data.

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