chore(dependabot): remove chainsel config

[graham-chainlink]

The chain selector custom rules didn work as expected because config does not allow multiple of the same package-ecosystem eg gomod. However we no longer need this as MCMS is now using the remote chainselector api

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[Copilot]

Pull request overview

Removes the custom Dependabot configuration that attempted to prioritize github.com/smartcontractkit/chain-selectors updates, since the approach didn’t work with Dependabot’s per-ecosystem constraints and the project no longer needs it (MCMS now uses the remote chainselector API).

Changes:

• Removed the dedicated high-priority gomod update block for github.com/smartcontractkit/chain-selectors.
• Removed the corresponding ignore rule that previously excluded chain-selectors from the general gomod updates.

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[cl-sonarqube-production]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
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No data about Duplication

See analysis details on SonarQube