fix: IDE completion no longer wraps allowed keyword identifiers in backticks

[Copilot]

When completing keyword identifiers (e.g. auto, internal, extern) in positions where they are valid without escaping — model property names, object literal properties, and member expressions — the language server was incorrectly inserting backtick-quoted completions.

model Test { auto: string }

// Completing `Test.au|` produced: Test.`auto`  ❌
// Should produce:                 Test.auto     ✅

model Child extends Base {
  // Completing `au|` produced: `auto`  ❌
  // Should produce:             auto   ✅
}

Changes

• completion.ts — Added getIdentifierPrintContext() helper that returns "allow-reserved" when the identifier node's parent is a MemberExpression, ModelProperty, or ObjectLiteralProperty, and "disallow-reserved" otherwise. Updated addIdentifierCompletion to pass this context to printIdentifier instead of always using the default ("disallow-reserved").

• completion.test.ts — Two new tests covering keyword completion without backticks in member expression and model body contexts.

• Fixes Ide completion still add backtick when completing the reserved keyword in place they are allowed #6756

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[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/compiler@11426

commit: 50c5d36

[azure-sdk-automation]

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