Replace prebuild duration message emoji

[gtsiolis]

Description

Following up from a relevant discussions[1][2] (internal), this will replace the prebuild duration message emoji from 🎉 to ⏱️ to help disassociate the prebuild status (SUCCESS, FAIL) for from the prebuild task status.

// BEFORE 
🎉 Well done on saving 7 minutes

// AFTER
⏱️ Well done on saving 7 minutes

See parallel fix https://github.com/gitpod-io/website/pull/3164. 🏓

Follow-up improvements could include:

• Show prebuild logs for all tasks #9994
• Improve prebuild status messages including errors on the prebuild page #9111

How to test

Run a prebuild with a task that fails, causing a prebuild to fail, but notice the prebuilds duration message is using a different emoji that does not imply a successful prebuild.

Release Notes

Replace prebuild duration message emoji

Werft options:

• /werft with-local-preview
  If enabled this will build install/preview
• /werft with-preview
• /werft with-large-vm
• /werft with-integration-tests=all
  Valid options are all, workspace, webapp, ide, jetbrains, vscode, ssh

[werft-gitpod-dev-com]

started the job as gitpod-build-gt-replace-prebuild-duration-message-emoji.1 because the annotations in the pull request description changed
(with .werft/ from main)

[gtsiolis]

Thanks for taking a look, @jeanp413! ☀️

[jankeromnes]

Hey, cool new emojis! 😁 ✨

But FYI, I noticed a small spacing issue that seems new: #15508