fix: normalize discord agent newlines on 7.2

[elibosley]

Summary

• Backport Discord notification newline normalization from 7.3 to 7.2.
• Preserve Pujit Mehrotra as the original commit author.
• Include the upstream regression test for Discord payload newline rendering.

Original PR: #2527
Original commit: 309ae17

Root Cause

Discord status reports could pass literal \n, \r\n, or \r sequences through DESCRIPTION and CONTENT, so Discord rendered escaped newline text instead of real line breaks.

Validation

• bash emhttp/plugins/dynamix/agents/tests/discord_newline_test.sh

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📝 Modified Files:

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emhttp/plugins/dynamix/agents/Discord.xml
emhttp/plugins/dynamix/agents/tests/discord_newline_test.sh

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[limetech]

LGTM

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