chore(deps): Remove ineffective dependabot rule

[vpomerleau]

Because

• The one-package-per-pr group did not have the desired effect
• Grouping likely stemmed from dependabot settings in github

This pull request

• Removes the ineffective one-package-per-pr group

Issue that this pull request solves

Closes: (issue number)

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Pull request overview

This PR updates the repository’s Dependabot configuration by removing the one-package-per-pr update group, which was intended to prevent grouping but did not have the desired effect. This keeps the configuration aligned with how Dependabot is actually behaving and avoids maintaining an ineffective rule.

Changes:

• Removed the one-package-per-pr group from the npm Dependabot update configuration.
• Retained the existing opentelemetry-packages grouping rule.

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