Fix node using itself as anchor resulting in incorrect ordering

[Adictya]

Fixes an edge case where if the node itself is provided to insertBefore as anchor as well, the node gets inserted at the wrong index.

Issue got noticed in a testcase of reversing an array in solid and trigerring a re-render which didn't result in the correct item order.

Tests included at both core and solid level

Also makes non existing anchor a non fatal error.

[pkg-pr-new]

@opentui/core

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@opentui/react

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@opentui/solid

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@opentui/core-darwin-arm64

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@opentui/core-darwin-x64

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@opentui/core-linux-arm64

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@opentui/core-linux-x64

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@opentui/core-win32-arm64

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@opentui/core-win32-x64

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commit: f532c70