Wrong type for EncoderMode used in rest-client

[luca-bassoricci]

Used PausableHttpPostRequestEncoder.EncoderMode instead of io.netty.handler.codec.http.multipart.HttpPostRequestEncoder.EncoderMode

I have removed all references to Netty's EncoderMode in favor of PausableHttpPostRequestEncoder's ones

Fix #37261

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[gsmet]

@luca-bassoricci would it be easy to add a small test in the -deployment module of the extension?

[luca-bassoricci]

@luca-bassoricci would it be easy to add a small test in the -deployment module of the extension?

test added

[geoand]

Can you please squash and rebase the commits when you are done?

[quarkus-bot]

✔️ The latest workflow run for the pull request has completed successfully.

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