fix: start mcp even if connection fails - [MCP-140]

[blva]

Proposed changes

MCP-140

Tests

Logs for a successfull flow

{"t":{"$date":"2025-09-02T11:25:09.980Z"},"s":"I","c":"MONGODB-MCP","id":1000002,"ctx":"server","msg":"Detected a MongoDB connection string in the configuration, trying to connect..."}
{"t":{"$date":"2025-09-02T11:25:09.980Z"},"s":"I","c":"MONGODB-MCP","id":1000002,"ctx":"server","msg":"Server with version 0.3.0 started with transport StdioServerTransport and agent runner {\"name\":\"cursor-vscode\",\"version\":\"1.0.0\",\"title\":\"unknown\"}"}
{"t":{"$date":"2025-09-02T11:25:09.980Z"},"s":"I","c":"MONGODB-MCP","id":1002002,"ctx":"telemetry","msg":"Telemetry is disabled."}
{"t":{"$date":"2025-09-02T11:25:58.619Z"},"s":"D1","c":"MONGODB-MCP","id":1003001,"ctx":"tool","msg":"Executing tool list-databases"}

Logs for a failed flow

{"t":{"$date":"2025-09-02T11:26:26.942Z"},"s":"I","c":"MONGODB-MCP","id":1000002,"ctx":"server","msg":"Detected a MongoDB connection string in the configuration, trying to connect..."}
{"t":{"$date":"2025-09-02T11:26:26.943Z"},"s":"I","c":"MONGODB-MCP","id":1000002,"ctx":"server","msg":"Server with version 0.3.0 started with transport StdioServerTransport and agent runner {\"name\":\"cursor-vscode\",\"version\":\"1.0.0\",\"title\":\"unknown\"}"}
{"t":{"$date":"2025-09-02T11:26:26.943Z"},"s":"I","c":"MONGODB-MCP","id":1002002,"ctx":"telemetry","msg":"Telemetry is disabled."}
{"t":{"$date":"2025-09-02T11:26:28.497Z"},"s":"E","c":"MONGODB-MCP","id":1004001,"ctx":"server","msg":"Failed to connect to MongoDB instance using the connection string from the config: Error: bad auth : authentication failed"}

Checklist

• I have signed the MongoDB CLA

[blva]

adding more logs to make it easier to debug

[Copilot]

Pull Request Overview

This PR modifies the MCP server to allow it to start successfully even when the initial MongoDB connection fails. Previously, connection failures would prevent the server from starting.

• Removes error throwing when MongoDB connection fails during server initialization
• Adds informational and error logging for connection attempts
• Enhances server startup logging with version and client information

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[coveralls]

Pull Request Test Coverage Report for Build 17402691381

Details

• 8 of 13 (61.54%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.02%) to 80.962%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/server.ts	7	12	58.33%

Files with Coverage Reduction	New Missed Lines	%
src/server.ts	1	78.3%

Totals
Change from base Build 17383023562:	0.02%
Covered Lines:	4543
Relevant Lines:	5526

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💛 - Coveralls