Replace radio buttons with clickable buttons in Mesop UI

[davorrunje]

Description

The list of changes:

• replaces radio buttons with clickable buttons in Mesop UI
• adds Error message type for errors in running workflows
• adds exceptions with proper message for missing imports

Type of change

• New feature (a non-breaking change that adds functionality)

Checklist

• I have conducted a self-review of my own code
• I have made the necessary changes to the documentation
• My changes do not generate any new warnings
• I have added tests to validate the effectiveness of my fix or the functionality of my new feature
• I have included code examples to illustrate the modifications

[codecov]

Codecov Report

Attention: Patch coverage is 64.28571% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
fastagency/ui/mesop/message.py	52.94%	5 Missing and 3 partials ⚠️
fastagency/ui/mesop/base.py	0.00%	4 Missing ⚠️
fastagency/helpers.py	60.00%	1 Missing and 1 partial ⚠️
fastagency/base.py	83.33%	1 Missing ⚠️

Files with missing lines	Coverage Δ
fastagency/ui/mesop/data_model.py	100.00% <100.00%> (ø)
fastagency/ui/mesop/styles.py	100.00% <100.00%> (ø)
fastagency/base.py	92.30% <83.33%> (-0.49%)	⬇️
fastagency/helpers.py	60.00% <60.00%> (ø)
fastagency/ui/mesop/base.py	57.97% <0.00%> (ø)
fastagency/ui/mesop/message.py	55.08% <52.94%> (+0.71%)	⬆️

... and 2 files with indirect coverage changes