[FE] Tasks by type chart limit number of labels that can be selected

Problem to solve

Follow on from the discussion on 400 Error on cycle analytics page

We should set a limit to the number of labels that can be selected for the tasks by type chart.

Further details

• On load, the top N (10) labels should be preselected, the labels will be retrieved from the endpoint in #196582 (closed)
• There should be a max 15 labels that can be selected
• A warning should be displayed if a 16th label is clicked, Possible warning message: "Only 15 labels can be displayed at a time"

UI Changes

• Indicate the max # of labels that can be selected
• 10 labels selected by default
• Less than 10 labels: hide UI n/n labels selected
• 10 - 15 labels: display UI n/n labels selected
• 15 selected - disable selecting new labels

Documentation

Testing

Links / references

Requires #196582 (closed)