fix(takeLast): handle Infinity count

[yowainwright]

Description

takeLast(Infinity) currently allocates new Array(Infinity), which throws RangeError: Invalid array length.

This update assigns a growable buffer only for Infinity, while preserving the existing finite-count ring buffer and non-positive early-complete behavior.

• The regression test verifies that values are still emitted on completion.

Related issue (if exists)

• Refs fix(takeLast): prevent RangeError when count is Infinity #7608

[lbesecker195]

Traced the ring-buffer math for amount = Infinity: counter % Infinity is counter for every finite counter, start resolves to 0, and total becomes counter, so the completion loop emits every buffered value in order. Only the allocation needed to change. Test covers it. LGTM.