Slack messages re: skipped actions workflow runs look too much like failed runs

[PSalant726]

Describe the bug
When the GH bot is configured to update a slack channel about runs of a specific actions workflow, messages created for skipped runs of the workflow look too much like messages create for failed runs of the workflow.

To Reproduce
Steps to reproduce the behavior:

1. Configure the bot to alert a channel about a workflow (https://github.com/integrations/slack#workflow-notification-filters)
2. Trigger a run of the configured workflow
3. Skip the workflow run
4. Observe the message posted to the configured slack channel

Expected behavior
A message should be posted to the configured slack channel, but that message should clearly show that the run was skipped. The message should be visually distinct from a failure message.

Screenshots

Desktop (please complete the following information):

• OS: macOS 14.4.1
• Browser FF
• Version Nightly

Additional context
I would suggest using gray to represent skipped runs, vs. red which is currently used.
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