Better link Zimfarm recipe and CMS title

[benoit74]

Currently, the link between Zimfarm recipe and CMS title is pretty weak: CMS doesn't know which Zimfarm recipe(s) is (are) supposed to create ZIMs for a given title.

Consequences are :

• users can't easily switch from Zimfarm recipe to CMS title or vice-versa
• we can easily end-up where Zimfarm recipe changes the ZIM name (user update of recipe configuration or scraper update), CMS editor assumes a new title needs to be created (instead of updating existing one) and creates a new title with new ZIM name, which ultimately leads to duplicate ZIMs in the catalog
• corrolary of previous point is that CMS cannot help editors when ZIM name changes by suggesting updating the existing title name when it is already associated with same Zimfarm recipe (like say "hey, I have a new ZIM whose name is "xyz" ; the Zimfarm recipe creating this ZIM was previously associated with title "abc" ; do you wanna update "abc" title to "xyz"?)
• CMS cannot detect ZIM name conflicts: two Zimfarm recipes creating ZIMs with same name (and flavour if used) (would solve Detect conflict of ZIM names across recipes zimfarm#1037 when CMS is in use ; pretty sure we have another issue about this topic but I fail to find it)

[benoit74]

Having correct links between CMS title and Zimfarm would probably even by an enabler regarding metadata which needs to be fixed (side-issue or root cause of #88) ; we could easily imagine that publisher can in near future, from the a single UI (CMS probably), fix a metadata (e.g. title) in both CMS and Zimfarm recipe. This would allow to immediately fix the catalog, maybe the exisiting ZIM, and ensure next ZIMs will be correct.