Werk #15411: Render temperature units consistently with space in service outputs

Depending on the underlying check plugin, Checkmk rendered temperature units with or without a space in service outputs. As of this werk, Checkmk consistently renders temperatures with a space between the numerical value and the unit. Examples:

• "12.0 °C" instead of "12.0°C"
• "256.41 K" instead of "256.41K"

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