fix(mcp): keep servers healthy when ping is unsupported #6170

Job	Run time
Build Impact	16s
Shell Deploy Scripts	13s
Frontend Build	9m 43s
CLI Tests (macos-15)	12m 47s
CLI Tests (ubuntu-latest)	9m 7s
Rust Build Check (ubuntu-latest)	15m 47s
Rust Build Check (windows-latest)	32m 25s
CLI Tests (windows-latest)	11m 10s
Rust Build Check (macos-15)	25m 31s
DSH Profile Packaging (windows-latest)	0s
Impact-selected Linux / Relay Contract	0s
Rust / CLI Validation	8s
	1h 57m 7s

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