testing: use strings.SplitSeq and bytes.SplitSeq

[apocelipes]

To simplify the code. This is a follow-up for the CL 646216.

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from kyose chang:

Patch Set 1:

(1 comment)

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Message from Jorropo:

Patch Set 1: Commit-Queue+1

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-02-05T13:14:01Z","revision":"be98e921883b2f48629b6f3617107576c79d17e3"}

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Message from Jorropo:

Patch Set 1: -Commit-Queue

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Message from Go LUCI:

Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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Message from Salah (Globlost):

Patch Set 1: Code-Review+1

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Message from Salah (Globlost):

Patch Set 1:

(2 comments)

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Message from Alan Donovan:

Patch Set 1: Code-Review+2

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Message from Jorropo:

Patch Set 1: Code-Review+1

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This PR is being closed because golang.org/cl/646755 has been merged.