[receiver/solace]: Update the auth validation step #36386
+51
−1
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Description
The validation step should not allow configuring several auth methods when only one will be considered (the first one that's not nil in this order plain > xauth2 > external).
(technically this is a breaking change because some users might have several auth methods configured, but that doesn't make sense so it's unlikely to break many users if any)
Testing
One test with multiple auth methods was added.