Only show optional statuses on PR dashboard if they've been received

[xmo-odoo]

With #1062 it's now possible to have statuses which are either:

• ignored if never sent
• required if sent once (e.g. pending)

But currently the PR dashboard (image and page) don't differentiate, they'll display CI as valid but show an optional status as missing anyway, even when it's not required by the run e.g.

The PR in question does not auto-trigger ci/l10n and nobody has triggered it manually, so it's never sent and is not relevant to that PR, the checkbox should not appear until ci/l10n has been sent (which is a hair more complicated than the way it's handled when computing the state)