internal/zstd: optimize skipFrame by using io.CopyN

[aimuz]

Replaced the manual byte skipping logic with io.CopyN
to improve performance and reduce memory allocation.
This change simplifies the code by directly discarding
the bytes read, enhancing readability and efficiency.

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Patch Set 1:

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Patch Set 1:

(1 comment)

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Patch Set 1:

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Message from Zhen Li:

Patch Set 1:

(2 comments)

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Patch Set 2:

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Patch Set 2: Commit-Queue+1

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Patch Set 2: Auto-Submit+1 Code-Review+2 Commit-Queue+1

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This PR is being closed because golang.org/cl/615716 has been merged.