refactor: Remove depnameShort of terra* and kustomize

[secustor]

Changes:

Remove depNameShort of:

• terraform
• terragrunt
• kustomize

Context:

#8075

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[viceice]

This is possibly a breaking, becuase user configs can use depNameShort which we don't know.

There is also no easy migration.

[viceice]

@rarkins How should we handle the backward compability? Try to do some config migration? Migration in template processing?

[rarkins]

If want to do it in steps then we can do this:

1. Add logic somewhere around update flattening to set dep.depNameShort ||= dep.depName for backwards compatibility
2. Refactor managers progressively
3. Once they're all refactored, add migration logic to search/replace {{depNameShort}} to {{depName}} in renovate config.
4. Additionally, add logic - maybe during compile step - to log a deprecation warning if we find {{depNameShort}} in any string being compiled
5. Remove dep.depNameShort ||= dep.depName in a future major release

[viceice]

Can be merge now as we already have #8401 merged

[renovate-release]

🎉 This PR is included in version 24.39.2 🎉

The release is available on:

• GitHub release
• 24.39.2

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