Inefficient loading of results for Manual Search

[Misofist]

Describe the bug
When I go into a show and use the "manual search" option for an episode or season, the search results are loaded into the client via many requests.

Part of the reason for this is because the requested URL is /api/v2/providers/{provider}/results?limit=1000&showslug=&season=1&episode=1&page=1. At a minimum the client needs to make one request per provider.

But significantly worse, if the page has been freshly loaded then for most results requests the showslug filter isn't populated, which means that with my 683 show library some providers take as many as 9 requests to load all the pages of data.

To Reproduce

1. Add multiple shows to Medusa.
2. Wait for Medusa to complete a backlog search.
3. Open DevTools network tab. Filter to "results".
4. On any show, click the "manual search" button next to any episode.
5. Refresh the page.
6. Observe how many requests are made and whether they have the showslug specified.

Expected behavior
Medusa should make a single request to load in results from all providers. The Medusa client should specify the showslug property to correctly filter results to the current show.

Screenshots

Medusa (please complete the following information):

• OS: Docker on Ubuntu (Linux-5.15.0-161-generic-x86_64-with)
• Branch: master
• Commit: 1ed315660d99f6673a3bb53363fdff6902b89429
• Python version: 3.11.1
• Database version: 44.19

Debug logs (at least 50 lines):
No relevant log entries.

[Misofist]

Reproduced in v1.0.25 (1ed315660d99f6673a3bb53363fdff6902b89429).

Only difference in this version is that the showslug query parameter is absent entirely instead of just empty: