[WIP] Need Spector scenario for paging without nextlink/continuationToken

[Copilot]

• Explore repository structure and understand how Spector scenarios work
• Build and test the http-client-js package successfully
• Examine existing paging scenarios (continuationToken and nextLink patterns)
• Add new scenario for paging without nextlink/continuationToken
• Test the new scenario to ensure it generates correct code
• Validate that the changes work as expected

Successfully added a missing Spector scenario for paging without nextlink or continuationToken. The current paging.md file previously only covered scenarios with continuation mechanisms, but TypeSpec supports basic @list operations with just @pageItems and no continuation token.

Changes Made

Added a third scenario to packages/http-client-js/test/scenarios/http-operations/paging.md:

• Scenario: "Should emit a paging operation if it is simple pagination without nextlink or continuationToken"
• TypeSpec Operation: A simple @list operation with only @pageItems decorator and no continuation mechanism
• Generated Code: Tests verify the correct TypeScript interfaces and functions are generated for this basic pagination pattern

The new scenario covers:

• Simple TypeSpec operation: @list op simple(@query filter: string): { @pageItems pets: Pet[]; }
• Generated paging function with proper PagedAsyncIterableIterator return type
• Proper handling of pagination without continuation tokens (nextToken: undefined)
• All required TypeScript interfaces (SimpleOptions, SimplePageSettings, SimplePageResponse)

All existing tests continue to pass, and the new scenario generates 7 additional test cases that all pass successfully.

Fixes #6732.

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