fix(ci): gate fern-check job on docs OR fern_components

[weizhoublue]

Overview:

fix(ci): gate fern-check job on docs OR fern_components so self-editing workflow changes self-verify

Details:

Where should the reviewer start?

.github/filters.yaml:30 lists .github/workflows/pre-merge.yml under fern_components.

In pre-merge.yml, the step Parse custom MDX components declares this dependency:

if: needs.changed-files.outputs.fern_components == 'true'

Therefore, in pre-merge.yml, the job fern-check that contains it must ensure:

if: needs.changed-files.outputs.docs == 'true' || needs.changed-files.outputs.fern_components == 'true

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[github-actions]

👋 Hi weizhoublue! Thank you for contributing to ai-dynamo/dynamo.

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[weizhoublue]

@dagil-nvidia
Hi, please help check whether this follow-up PR for #12388 makes sense, thanks