[lexical-link][Bug Fix] avoid auto-linking urls in code snippets

[xnt]

Description

The AutoLinkPlugin (registerAutoLink underneath) does not take code blocks into account, and inserts AutoLinks in code blocks, even though this is not usually desired. This only happens if a highlighter plugin is not used. Can be easily reproduced in the Lexical playground.

This fix validates that the current block is not a code block before trying to insert auto-links. Also, adds a test with that check.

Closes #8028

Test plan

Before

After

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Project	Deployment	Review	Updated (UTC)
lexical	Error		Dec 18, 2025 10:48pm
lexical-playground	Error		Dec 18, 2025 10:48pm

[etrepum]

This introduces a dependency on @lexical/code from @lexical/link which breaks the build and is not desired. One way or another this issue should be addressed in a way that doesn't introduce this kind of dependency (note also that checking getType() is also not an acceptable solution because the type of a CodeNode can be any string if it's subclassed).

A cleaner possibility might be to add configuration to AutoLinkConfig to allow you to specify some predicates that control which nodes shouldn't be considered. The extensions could have a peer dependency to set this up automatically for CodeNode.

[etrepum]

#8123 should be a sufficient fix for this issue