docs: Update SAST docs documenting `SAST_ANALYZER_IMAGE_TAG`
What does this MR do?
Documents the SAST_ANALYZER_IMAGE_TAG variable which was overlooked with !63921 (merged)
Relates to #232660 (closed)
Does this MR meet the acceptance criteria?
Conformity
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This change is backwards compatible across updates, or this does not apply.
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Security
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