I'm rusty of some of the lesser known CW support ships.
Are they're any Interdiction type vessels either side used before the GCW era?
I can only think of Rebels as earliest appearance. It's be fun to see some of those upgrades used in the new factions.
There Isn't any current canon source that I am aware of that mentions interdictors before the empire. In legends the interdiction technology was around in the old republic times. The sith interdictor (Darth Revan's flagship) had interdiction technology. By the time of the clone wars though the technology had been lost until the empire "rediscovered" it.
One-off experimental prototypes doesn't seem all that farfetched. Especially if they required a jedi to operate (force to sense ships in hyper?) - that would have made them useless to the empire.
The Republic at the time of the Clone Wars is a bit of an enigma, in terms of what it has and doesn't have. Episode 2 makes out the Republic to be almost pacifistic (after all, they have no standing army; hence, the Clones), and yet they have dozens if not hundreds of Acclamators on hand at the end of the film to deploy their army en masse.
Then there are ships like the Mandator-line, which we can infer their existence (from the Mandator-IV) but not prove, as they've never made in appearance in any media. At what point in the timeline do I-III exist? Old Republic? High Republic? Pre-prequels Republic? Unknown.
The prequels in general muddied the waters a bit. I remember a time when Star Destroyers were essentially the biggest ships in the galaxy (with exception for things like the Executor), and then Episode 1 came out and introduced ships that were twice as big in length and probably four times as large in volume -- and they were owned by a bank, of all things.
All this is to say... maybe the Republic had Interdictors? But the Rebels TV show sure makes it seem like it's new technology.
Detainer CC-2200s get a brief mention in Dark Lord (high-quality EU read.) It’s set immediately after RotS, and there’s a smuggler already familiar with them, which is all but a guarantee the Republic used them.
In terms of actual canonicity it’s a CINO early-Empire ship courtesy of the same author.
I think the interdiction tech was generally regarded as a development in Imperial science and engineering so I'm not sure if the tech existed in the CW. Though the CW did have its fair share of unique "superweapons" that could be brought into the game, with the obvious choice being the malevolence.