#2913: Improve different context menu style / functionality between Scatterplot in Trellis vs native Scatterplot

[LesiaPavlenko]

Some updates according DG-NX meeting:

• [x] Add formula lines functionality
• [x] Rename in Trellis plot the "Inner viewer" to the actual name of the current inner viewer. Like "Scatter plot".

[dnillovna]

This issue has been mirrored in Jira: https://reddata.atlassian.net/browse/GROK-16200