[Playground] Use current Go SDK by default

[eantyshev]

addresses #24120

Make Playground Examples CI using the current Go SDK from ./sdks/go for tests consistency

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[eantyshev]

here we actually only fixing a bug which rewrites previous build args and makes only SDK_TAG visible

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[olehborysevych]

LGTM

[damccorm]

LGTM