extension/src/goTest.ts: fix testFunctions filter

[vaniog]

Add conditional filtering for test functions based on provided
function name in _subTestAtCursor

Using functionName if it was provided as argument, otherwise
find any test function containing the cursor.

This change fixes a bug that previously required the cursor to be
within the parent function to run subtests.
Now, subtests can be executed even if the cursor is not positioned
in the parent function.

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Patch Set 1:

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Patch Set 3: Code-Review+1 Commit-Queue+1

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Patch Set 3: Code-Review+2

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This PR is being closed because golang.org/cl/638755 has been merged.