ref(notification platform): Update formatting

[ceorourke]

Various updates to the notification platform Slack messages:

Updated Deploy Notification Format

We now shorten the release version as we do in the product and turn the links into buttons in a row
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After

Removed Bullet Points from Help Text

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Changed color of workflow notification attachment bar

Now only issue alerts are red, workflow notifications and deploy notifications use the "info" level blue
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[evanpurkhiser]

nice

[mgaeta]

Now that text is optional we should be able to change the payload from

return {
    "text": text,
    "mrkdwn_in": ["text"],
    "color": LEVEL_TO_COLOR[color or "info"],
    **kwargs,
}

to

if text:
    kwargs["text"] = text
    kwargs["mrkdwn_in"] = ["text"]

return {
    "color": LEVEL_TO_COLOR[color or "info"],
    **kwargs,
}