chore: E2E tests failure reporter

[Vangaorth]

Short description

This PR adds a Github action to report E2E tests failure to Slack.

List of changes proposed in this pull request

• Added proper worflow on E2E test to notify a failure

How to test

Refer to the working message in the Slack channel.

[pagopa-github-bot]

	Warnings
⚠️	Please include a Pivotal story or Jira ticket at the beginning of the PR title

Example of PR titles that include pivotal stories:

• single story: [#123456] my PR title
• multiple stories: [#123456,#123457,#123458] my PR title

Example of PR titles that include Jira tickets:

• single story: [PROJID-123] my PR title
• multiple stories: [PROJID-1,PROJID-2,PROJID-3] my PR title

Generated by 🚫 dangerJS against ed60432

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5f5f644) 47.29% compared to head (ed60432) 47.29%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5452   +/-   ##
=======================================
  Coverage   47.29%   47.29%           
=======================================
  Files        1463     1463           
  Lines       31366    31366           
  Branches     7628     7628           
=======================================
  Hits        14834    14834           
  Misses      16474    16474           
  Partials       58       58           

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[CrisTofani]

LGTM