feat: add slack notification on failed integration tests

[hanshal101]

Fixes #332
Closes #332

Description

This PR adds the feature to give alerts on slack when the integration tests fails.

TODO

@anfredette , we need to add a Github secret named SLACK_WEBHOOK_URL to enable the alerts.

[codecov]

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[dave-tucker]

Thanks for the contribution. I left some comments, but reading up on this some more it seems like webhooks are being deprecated no longer recommended for this usecase + we don't have the ability to add them easily on the K8s slack instance.

We can certainly request a webhook from the admins, but it might make more sense to do use the Github integration like this: https://github.com/integrations/slack?tab=readme-ov-file#workflow-notification-filters

That's more flexible since we can subscribe/unsubscribe to notifications in the channel whenever we like.

[hanshal101]

Thanks @dave-tucker for the review, I have updated the CI to the official slackapi, I have added a simple string for the message, let me know if we need more detailed one or not.