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credentials/alts: preserve boundAccessToken in altsTC.Clone (#9345)

`altsTC.Clone` does not copy `boundAccessToken`, so a cloned ALTS
credential silently loses the token and performs its handshake without
it.

RELEASE NOTES: none
N
Nilesh Patil committed
4793ad0474669eafbd5346c8a3d098fdfa542498
Parent: 3284af7
Committed by GitHub <noreply@github.com> on 8/21/2026, 8:29:11 PM