Increase PlantUML width/height limits
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=450850) </details> <!--IssueSummary end--> ### Proposal Some customers require large diagrams when rendering PNG images with PlantUML. The current default width/height of 4096 is not sufficient. Diagrams will be cut off at the maximum height (or width). We should consider increasing the `PLANTUML_LIMIT_SIZE` limit on our PlantUML integration for GitLab.com. See the [PlantUML FAQ](https://plantuml.com/faq#e689668a91b8d065). It's possible that this have memory implications, but we could start at something like 8192. This will likely need infrastructure to update this and ensure it scales. ![image](/uploads/59e1349bde7b3c85b522a4ce9707478d/image.png){width=487 height=179} ![image](/uploads/12bfa70bf792ed17cbb96e5d66df54f6/image.png){width=413 height=140} ![image.png](/uploads/e54c49944343bc69e9ad414cfcad9c30/image.png){width=959 height=31}
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