fix: only return local keys from /eth/v1/keystores #20604

Job	Run time
Build	2m 16s
Build	2m 16s
Build	2m 16s
Build	2m 16s
Build	2m 16s
Build	2m 16s
Build	2m 16s
Endpoint sim tests	2m 37s
Endpoint sim tests	2m 37s
Endpoint sim tests	2m 37s
Endpoint sim tests	2m 37s
Endpoint sim tests	2m 37s
Endpoint sim tests	2m 37s
Endpoint sim tests	2m 37s
Deneb sim tests	5m 23s
Deneb sim tests	5m 23s
Deneb sim tests	5m 23s
Deneb sim tests	5m 23s
Deneb sim tests	5m 23s
Deneb sim tests	5m 23s
Deneb sim tests	5m 23s
Multifork sim test	11m 35s
Multifork sim test	11m 45s
Multifork sim test	11m 37s
Multifork sim test	11m 15s
Multifork sim test	11m 25s
Multifork sim test	11m 41s
Multifork sim test	11m 24s
Mixed clients sim tests	7m 39s
Mixed clients sim tests	7m 46s
Mixed clients sim tests	7m 41s
Mixed clients sim tests	7m 45s
Mixed clients sim tests	7m 21s
Mixed clients sim tests	7m 42s
Mixed clients sim tests	7m 32s
Eth backup provider sim tests	7m 0s
Eth backup provider sim tests	7m 0s
Eth backup provider sim tests	7m 0s
Eth backup provider sim tests	7m 0s
Eth backup provider sim tests	7m 0s
Eth backup provider sim tests	7m 0s
Eth backup provider sim tests	7m 0s
	4h 15m 0s

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