wireup: add tcp as fallback auxiliary transport for rc and dc#11307
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When UCX_TLS=rc_v is used on systems where UD is unavailable (e.g. SoftRoCE/rxe), wireup fails because no CONNECT_TO_IFACE transport exists for bootstrap. Add tcp as a fallback auxiliary transport in the rc_v, rc_x, rc, dc, and dc_x aliases so that TCP-based wireup can be used when UD is not available. Fixes openucx#4794
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Summary
When UCX_TLS=rc_v is used on systems where UD transport is unavailable (e.g. SoftRoCE/rxe), endpoint creation fails because no CONNECT_TO_IFACE transport exists for wireup bootstrap. This adds TCP as a fallback auxiliary transport in the rc_v, rc_x, rc, dc, and dc_x aliases. UD is still preferred when available due to lower latency scoring; TCP is only used when UD cannot be loaded.
Fixes #4794