chore: move perf advisor to long running tests - MCP-269

[blva]

Proposed changes

• move the perf advisor tasks to post merge and also add the option to trigger them in a specific branch so that we can still use them when doing changes

Checklist

• I have signed the MongoDB CLA

[Copilot]

Pull Request Overview

This PR moves performance advisor tests to a separate long-running test suite that runs post-merge instead of in the regular test pipeline. Key changes:

• Separates long-running tests from standard integration tests
• Increases test timeout for long-running tests to 2 hours
• Adds new npm script to run long-running tests separately

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
vitest.config.ts	Adds new test project for long-running tests with 2-hour timeout and excludes these tests from standard integration suite
tests/integration/helpers.ts	Increases default long-running test wait timeout from 15 to 20 minutes
package.json	Adds new npm script test:long-running-tests to run the long-running test suite

[coveralls]

Pull Request Test Coverage Report for Build 18714130420

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 181 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-1.8%) to 80.129%

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Files with Coverage Reduction	New Missed Lines	%
src/common/atlas/cluster.ts	10	50.44%
src/common/atlas/apiClient.ts	21	71.18%
src/tools/atlas/read/getPerformanceAdvisor.ts	61	32.46%
src/common/atlas/performanceAdvisorUtils.ts	89	4.03%

Totals
Change from base Build 18709444254:	-1.8%
Covered Lines:	6018
Relevant Lines:	7378

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💛 - Coveralls