Fixes #2599 Extend PV BB with expression profiles - wrong formula expression in plasma

[rwmcintosh]

Fixes #2599

Description

Let's select the most frequently occurring formula for the nex ParameterValue from the matching ExpressionParameters.
Including values, so if there's a formula or value that occurs more than others, we will use that.

This is when we extend a ParameterValueBB to include expression parameters for a container and molecule.

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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• Algorithm update - updates algorithm documentation/questions/answers etc.
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