chore: warn about the usage of deprecated cli arguments MCP-107

[kmruiz]

Proposed changes

Checklist

• I have signed the MongoDB CLA

[Copilot]

Pull Request Overview

This PR adds functionality to warn users about deprecated CLI arguments, specifically targeting the --connectionString argument. The change encourages users to adopt the preferred method of using positional arguments or environment variables for connection strings.

• Implements a new warnAboutDeprecatedCliArgs function that checks for deprecated CLI arguments and issues warnings
• Integrates the warning system into the CLI config parsing flow
• Adds comprehensive unit tests to verify the deprecation warning behavior

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/common/config.ts	Adds the warnAboutDeprecatedCliArgs function and integrates it into CLI parsing
tests/unit/common/config.test.ts	Adds unit tests for the deprecated CLI argument warning functionality

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[coveralls]

Pull Request Test Coverage Report for Build 17373727595

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 16 of 16 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 80.948%

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Totals
Change from base Build 17330103427:	0.04%
Covered Lines:	4536
Relevant Lines:	5519

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💛 - Coveralls