Update workflows docs for GitLab support

[mintlify]

Summary

• Updated workflows documentation to reflect that push triggers now work with both GitHub and GitLab repositories
• Changed the GitHub App requirement note to mention both GitHub App and GitLab connection options
• Updated the repo field description to clarify it works with both providers
• Applied equivalent changes to French, Spanish, and Chinese translations

Triggered by mintlify/server#4408.

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Note

Low Risk
Low risk documentation-only updates; no runtime logic changes. Risk is limited to potential user confusion if wording/links are incorrect across translations.

Overview
Updates the Workflows docs to reflect GitLab repository support for push-triggered workflows.

Clarifies that repos referenced in context and on.push.repo must be accessible via either the Mintlify GitHub App or a GitLab connection, and updates the repo field description to state it works for both providers (applied to EN, ES, FR, and ZH pages).

^{Written by Cursor Bugbot for commit 290ca09. This will update automatically on new commits. Configure here.}

[mintlify]

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Project	Status	Preview	Updated (UTC)
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[prodev1000]

Reviewed: documentation accurately broadens workflow repo support from GitHub-only wording to GitHub and GitLab.