ui: Iciclechart improved error copy

[manojVivek]

Includes:

• Refinements to the previous error messages
• Option to pass in additional help text through context
• Disable the selection of iciclechart for non delta profiles

[alwaysmeticulous]

✅ Meticulous spotted visual differences in 113 of 311 screens tested, but all differences have already been approved: view differences detected.

Meticulous evaluated ~4 hours of user flows against your PR.

_{Last updated for commit 673eeb8. This comment will update as new commits are pushed.}

[brancz]

Should we maybe just not allow people to select it in those cases in the first place?

[manojVivek]

UX wise I feel this would be better, just not allowing them to select could leave them puzzled on 'why?'.