[bisq-network/bisq] Show mediation summary to the trader who did not open arbitration (#5062)

[refund-agent2]

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### Description

The part who opens arbitration receives the mediation report when opening an arbitration ticket. The other does not.


### Steps to reproduce

Reject mediation suggestion.

### Expected behaviour

Display mediation summary to both traders.

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https://github.com/bisq-network/bisq/issues/5062
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