Add Pagination and Polling Support for MCP 2.0 Spec Conversion

## Problem statement

Azure MCP needs first-class pagination and polling (LRO) behavior under the MCP 2.0 stateless conversion so tools can handle multi-page and long-running Azure operations consistently.

## Outcome

Azure MCP tools implement consistent MCP 2.0-aligned pagination and polling patterns that are reusable across toolsets and compatible with stateless protocol behavior.

## Scope

- Define and implement pagination and polling patterns required by MCP 2.0 conversion
- Apply the shared implementation in relevant Azure MCP tool execution paths
- Validate behavior for continuation, completion, timeout, and error surfaces

## Child and related work

This feature is tracked as child work under:
- `microsoft/mcp#2968` [EPIC] MCP Stateless Protocol Platform Adoption

## Success criteria

- [ ] Pagination and LRO polling flows are implemented for MCP 2.0 conversion scenarios
- [ ] Behavior is consistent across targeted tool surfaces
- [ ] Edge-case handling for partial pages, long-running completion, and failures is covered

## Dependencies

- MCP 2.0 stateless protocol migration work in `microsoft/mcp#2968`
- Core transport and compatibility changes tracked in sibling children of that epic