chore: version 7.56.0 in main branch

[themr0c]

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Pull Request checklist

The author and the reviewers validate the content of this pull request with the following checklist, in addition to the automated tests.

• Any procedure:
  • Successfully tested.
• Any page or link rename:
  • The page contains a redirection for the previous URL.
  • Propagate the URL change in:
    • Dashboard default branding data
    • Chectl constants.ts
• Builds on Eclipse Che hosted by Red Hat.
• the Validate language on files added or modified step reports no vale warnings.

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[max-cx]

@themr0c, I wonder if we also need to check and update the following variables:

prod-stable-channel-starting-csv: eclipse-che.v7.49.0
prod-operator-index: registry.access.redhat.com/redhat/community-operator-index:v4.10
ocp4-ver: "4.10"
devworkspace-operator-version-patch: "0.15.2"
devworkspace-operator-index: registry.redhat.io/redhat/redhat-operator-index:v4.10

If yes on any of them, then I have two suggestions:

1. Group into one separate section of this file all the variables that we need to double-check each time we update the release number
2. Add a comment with the link to the page where we can quickly check the latest value of each of those variables.

[max-cx]

Approving, but please first read my comment #2479 (comment).