Fix InjectionPointModifier for repeated annotations on method parameters; add grpc test

[manovotn]

Fixes #44932

After some digging into the code in InjectionPointModifier, it seems that the condition is basically a leftover from before we changed how this transformer works for parameters and should not be needed.
I did some local testing but I'll let the CI prove me wrong :)

[quarkus-bot]

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It should be safe to merge provided you have a look at the other checks in the summary.

[cescoffier]

@mkouba can you have a look?

[mkouba]

Looks good and I think that we could merge this pr but I wonder if there should be a test in ArC too because it's a general problem, not grpc-specific. If I'm not mistaken, any repeating qualifier used in a CDI constructor/initializer method would fail.

We could that test in a follow-up pr though.

@manovotn WDYT?

[manovotn]

Looks good and I think that we could merge this pr but I wonder if there should be a test in ArC too because it's a general problem, not grpc-specific. If I'm not mistaken, any repeating qualifier used in a CDI constructor/initializer method would fail.

Yea, the same occurred to me 👍