[2.x] fix: Preserve ‘=’ in remote cache header values (#9534)

Problem remoteCacheHeaders entries are parsed in GrpcActionCacheStore.AuthCallCredentials with h.split(“=”), which splits on every =. Java’s split discards trailing empty strings, so a Basic auth header such as authorization=Basic dXNlcjpwdw== produces exactly two elements and matches List(k, v) with the base64 padding silently removed. The truncated credential is rejected by the cache server with UNAUTHENTICATED.

Solution Split on the first = only, keeping the remainder of the string verbatim as the header value. The error case narrows to a header containing no = at all.

Generated-by: Claude Opus 5

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