Color outline to indicate task execution state in scenario dag

[AlexandreSajus]

Description

The scenario dag tasks could have outline colors to indicate in which state they are in when the scenario is submitted:

• yellow means "pending"
• orange means "running"
• green means "ran"
• red means "errored"
• nothing means "not pending"

For example, here it would mean that clean_data has ran without issue, predict is currently running and evaluate will be ran afterwards.

This is very similar to a product an INCREDIBLE engineer made (or Zerve):

Solution Proposed

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Impact of Solution

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Additional Context

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Code of Conduct

• [X] I have checked the existing issues.
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