Remove some agencies from left-hand search navigation that are confusing users

[lucasmbrown-usds]

Summary

Someone wrote in saying they searched for ARPA-H cancer grants and didn't see any.

But that's because they used the "top level" ARPA-H that's been deprecated: https://simpler.grants.gov/search?query=cancer&agency=ARPAH

Whereas the actual grants they're looking for are nested under HHS / ARPA-H now: https://simpler.grants.gov/search?query=cancer&agency=HHS-ARPAH

We want to prioritize fixing this to return accurate data and not mislead our search users.

Here are some example agencies to quickly remove, (based on ID) as listed here: https://github.com/HHS/simpler-grants-gov/blob/main/frontend/src/components/search/SearchFilterAccordion/SearchFilterOptions.ts#L213

These are all top-level agencies:

1. CNCS
2. WWC
3. USEAC
4. ARPAH (note: do NOT remove "HHS-ARPAH" which is nested under HHS)
5. ECP
6. FMCS
7. GDIT and all sub, nested agencies (unless this is already fixed by [Issue #3204] Remove opportunities connected to test agencies from search results #3234)
8. IVV (unless this is already fixed by [Issue #3204] Remove opportunities connected to test agencies from search results #3234)
9. MCC

Reproducibility

I tried multiple times and saw the bug every time

How to reproduce the bug

No response

Browser

Chrome

Code of Conduct

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