[v0.21] cherry-picks for v0.21.0-rc2#5909

Merged

crazy-max merged 3 commits intomoby:v0.21from

crazy-max:v0.21-picks-rc2

Apr 11, 2025

Commits on Apr 11, 2025

exporter: add session exporter capability

tonistiigi
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crazy-max
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exporter: allow session exporter to access refs

tonistiigi
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crazy-max
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source: add metadata-only transfer option for local source

tonistiigi
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crazy-max
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