[lexical] Bug Fix: add missing flow type for getNearestEditorFromDOMNode

[kirandash]

Description

Current behavior:

• The getNearestEditorFromDOMNode function is missing Flow type definition in Lexical.js.flow
• This causes Flow errors when importing and using the function, requiring $FlowFixMe to suppress

Changes being added:

• Add proper Flow type definition for getNearestEditorFromDOMNode in Lexical.js.flow
• This allows proper type checking when importing the function
• Removes the need for $FlowFixMe suppression

Closes #7148

Test plan

Before

// packages/lexical-playground/src/test-flow-issue.js.flow
// @flow strict

import {getNearestEditorFromDOMNode} from 'lexical';
// Flow error: Cannot import getNearestEditorFromDOMNode because there is no getNearestEditorFromDOMNode export in lexical. [missing-export]

function test(node: Node) {
  getNearestEditorFromDOMNode(node);
} 

After

// packages/lexical-playground/src/test-flow-issue.js.flow
// @flow strict
import {getNearestEditorFromDOMNode} from 'lexical';
// No Flow errors, proper type checking works

function test(node: Node) {
  getNearestEditorFromDOMNode(node);
} 

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Name	Status	Preview	Comments	Updated (UTC)
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[etrepum]

Looks good!