zeta2: Improve context search performance (#41501)

We'll now perform all searches from the context model concurrently, and
combine queries for the same glob into one reducing the total number of
project searches.

For better readability, the debug context view now displays each
top-level regex alternation individually, grouped by its corresponding
glob:

<img width="1592" height="672" alt="CleanShot 2025-10-29 at 19 56 03@2x"
src="https://github.com/user-attachments/assets/f6e8408e-09d6-4e27-ba11-a739a772aa12"
/>

  
Release Notes:

- N/A
b8cdd38efbAgus Zubiaga committed on 10/29/2025, 11:06:49 PM· committed by GitHubparent87f9ba3
5 files changedLine totals unavailable