chore: downgrade yargs-parser to v21

[himanshusinghs]

Proposed changes

We need to keep yargs-parser pinned to v21 because it eventually ends up on the library path of mongodb-mcp-server which gets bundled in VSCode extension and yargs-parser@22 is not compatible with webpack (does not work at all) and creates issues like mongodb-js/vscode#1149

So until we find a way to remove yargs-parser from the lib path, which should be doable, we need to keep yargs-parser pinned to v21.

Checklist

• I have signed the MongoDB CLA

[Copilot]

Pull Request Overview

This PR downgrades the yargs-parser dependency from version 22 to version 21.1.1 to resolve webpack compatibility issues when bundling the MCP server for VS Code extensions.

• Pins yargs-parser to version 21.1.1 instead of using the caret range ^22.0.0
• Reorganizes @vitest/eslint-plugin in the devDependencies list

[coveralls]

Pull Request Test Coverage Report for Build 18309555363

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.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 82.462%

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Files with Coverage Reduction	New Missed Lines	%
src/common/atlas/apiClient.ts	2	76.58%

Totals
Change from base Build 18276805864:	-0.04%
Covered Lines:	5294
Relevant Lines:	6308

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💛 - Coveralls