Fix `gitlab_service_slack` IDs
Description
Resolves #1012 (closed)
Slack service IDs where changed in https://github.com/gitlabhq/terraform-provider-gitlab/pull/821#discussion_r842671210 which breaks all existing gitlab_service_slack resources which were created before v3.9.0 of the Gitlab terraform provider.
PR Checklist Acknowledgement
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I acknowledge that all of the following items are true, where applicable: - Resource attributes match 1:1 the names and structure of the API resource in the GitLab API documentation.
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Examples are updated with:
- A *.tf file for the resource/s with at least one usage example
- A *.sh file for the resource/s with an import example (if applicable)
- New resources have at minimum a basic test with three steps:
- Create the resource
- Update the attributes
- Import the resource
- No new
//lintignorecomments were copied from existing code. (Linter rules are meant to be enforced on new code.)