EPMHLM-444 || MCP. Tools. Add new tool get all selectors

[AleksandrParamonoff]

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[Copilot]

Pull request overview

This PR adds a new MCP tool getAllSelectors that retrieves all selector records stored in the Healenium backend. The implementation follows existing patterns for simple GET endpoints without parameters.

• Adds getAllSelectorsTool to fetch all selectors from /healenium/selector/all endpoint
• Includes comprehensive test coverage with integration tests and timeout handling
• Registers the new tool in the MCP server's tool registry

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal/mcp_handlers/tools.go	Implements getAllSelectorsTool() function that makes a GET request to /healenium/selector/all and returns the JSON response as text content. Registers the new tool in the RegisterTools function.
internal/mcp_handlers/tools_test.go	Adds createHealeniumMockServerForAllSelectors() helper function, TestGetAllSelectorsTool_Integration() with test cases for successful fetch, empty list, and error scenarios (404, 500), and TestGetAllSelectorsTool_Timeout() to verify timeout behavior.

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