chore: remove serverless connection tests

[addaleax]

Our serverless cluster is no longer a serverless cluster, since they are being converted to Flex tier clusters.

This does not remove every mention of serverless from the Compass source code, although I imagine we would be able to do so relatively soon.

Refs: https://www.mongodb.com/docs/atlas/billing/serverless-instance-costs/

Description

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• If this change updates the UI, screenshots/videos are added and a design review is requested
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[Copilot]

Pull Request Overview

This PR removes serverless cluster connection tests from the Compass codebase, as MongoDB's serverless clusters are being converted to Flex tier clusters. The changes clean up test code, environment variables, and configuration files that were previously used for serverless connectivity testing.

Key Changes:

• Removed serverless-specific test cases from connection test suites
• Cleaned up serverless-related environment variables from configuration files
• Removed serverless connection string construction and test utilities

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/data-service/src/connect.spec.ts	Removed serverless host import, connection string constant, and serverless connectivity test
packages/compass-e2e-tests/tests/connection.test.ts	Removed serverless host from environment variable checks and deleted two serverless connection tests (connection string and form-based)
.evergreen/functions.yml	Removed E2E_TESTS_SERVERLESS_HOST environment variable declaration
.evergreen/connectivity-tests/run.sh	Removed E2E_TESTS_SERVERLESS_HOST from Docker container environment variable pass-through

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[codeowners-service-app]

Assigned nbbeeken for team compass-developers because lerouxb is out of office.