Fix sequence counting across separated zeros

[krotname]

Motivation

• The existing maximumSequenceWithOneZero implementation accumulated runs across multiple non-consecutive zeros and returned incorrect results for inputs like [1, 0, 1, 0, 1].

Description

• Replace the single accumulating counter with previousCount and currentCount and compute maxCount as previousCount + currentCount while iterating, so only a single zero-separated pair contributes to the sum.
• Remove the unnecessary ArrayList copy and add a regression test shouldNotCountAcrossMultipleSeparatedZeros in MaximumSequenceWithOneZeroTest.java that asserts maximumSequenceWithOneZero(List.of(1, 0, 1, 0, 1)) == 2.

Testing

• Ran the focused unit test with mvn -q -Dtest=interview.MaximumSequenceWithOneZeroTest test and it passed.
• Ran the full test suite with mvn -q test and mvn -q verify, both completed without failures.

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Codex Task

[krotname]

Superseded by the validated combined merge in #115: #115