Fix: OVH provider: avoid failing on 404

[arnaudmorin]

When using OVHcloud provider, some DNS record may be deleted while we are looping over them.
This patch will discard any records that are not found anymore.

Description

Fixes #ISSUE

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: arnaudmorin / name: Arnaud Morin (007b72b)

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[mloiseleur]

@arnaudmorin Wdyt of using the SoftError mechanism used in some other providers ?

Btw, do you think ovh can host its own webhook provider ? (See here)