chore: disable code health runs on forks and add dependabot cooldown

[himanshusinghs]

Proposed changes

This PR adds a 7 days of cooldown for dependabot before pulling updates for npm dependencies.

Additionally we are disabling code health checks on forks.

Checklist

• I have signed the MongoDB CLA

[Copilot]

Pull Request Overview

Purpose: Introduce a Dependabot cooldown for most npm dependency updates while exempting specific MongoDB-related scopes, and disable code health workflow runs on forked PRs.

• Add 7-day cooldown configuration for Dependabot with exclusions for @mongodb-js/* and @mongosh/*.
• Restrict code-health workflow to only run for Dependabot PRs (removing fork-based trigger).

Reviewed Changes

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

File	Description
.github/workflows/code-health-fork.yml	Adjusts job condition to stop running code-health checks on forked PRs.
.github/dependabot.yml	Adds cooldown configuration to throttle update frequency except for specified dependency scopes.

[coveralls]

Pull Request Test Coverage Report for Build 18555147447

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 8 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 82.404%

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Files with Coverage Reduction	New Missed Lines	%
src/tools/atlas/connect/connectCluster.ts	8	73.5%

Totals
Change from base Build 18552067365:	-0.1%
Covered Lines:	5798
Relevant Lines:	6901

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💛 - Coveralls