Add limitation - Pipelines cannot read from variable library

[MicahRowlandMicrosoft]

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N/A – Documentation update to reflect current product limitation observed in customer tenant deployment involving Workspace Private Link preventing Fabric Pipelines from resolving Variable Library references. No feature change required.

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Learn Build status updates of commit 2f6049f:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/security/security-workspace-level-private-links-support.md	✅Succeeded

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[MicahRowlandMicrosoft]

#sign-off

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @msmimart

[msmimart]

@MicahRowlandMicrosoft and @advaitha-karthikeyan,

For discoverability, should this also be mentioned in the Variable Library support section and the Pipeline, Copy job, and Mounted Data Factory support section of this same article?

[v-regandowner]

@msmimart

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[msmimart]

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