docs: add language specifiers to scheduler-event-log code fences

[mesutoezdil]

Adds bash for kubectl command+output blocks and plaintext for raw event/log output blocks in scheduler-event-log.md, across docs, the v2.9.0 versioned copy, and both zh translations.

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📥 Commits

Reviewing files that changed from the base of the PR and between c404842 and 0f8ef86.

📒 Files selected for processing (4)

• docs/developers/scheduler-event-log.md
• i18n/zh/docusaurus-plugin-content-docs/current/developers/scheduler-event-log.md
• i18n/zh/docusaurus-plugin-content-docs/version-v2.9.0/developers/scheduler-event-log.md
• versioned_docs/version-v2.9.0/developers/scheduler-event-log.md

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