Use cds-alert

[xtreme-vikram-yadav]

What this PR does / why we need it:

• Uses cds-alert for alerts.
• Refactors alert banners to use shared alert component

Which issue(s) this PR fixes

• Fixes Add standard alerts component #2303

[mklanjsek]

This is really cool, but we need a way to document and showcase it, so adding one or two storybook stories would be helpful.

[mklanjsek]

Looks good! Before merging, can you just make one small change for card: cds-alert-group is too close to the form title, it needs something like margin-bottom: 10px;

Also a question: why is alert inside modal not consuming the whole parent width like alerts inside other components?

[GuessWhoSamFoo]

The storybook alert should be under its own group rather than adding alerts to every relevant component in storybook. (e.g. show a summary and/or modal with alert under the Alert component)

[mklanjsek]

The storybook alert should be under its own group rather than adding alerts to every relevant component in storybook. (e.g. show a summary and/or modal with alert under the Alert component)

@GuessWhoSamFoo Since alert component is not exported as official Octant component, I thought just adding the alerts to stories that use it in practice would be sufficient?

[GuessWhoSamFoo]

Okay, I retract that statement. LGTM

[mklanjsek]

Please fix the css and merge.