chore: fix branch matching in ignoreBranches

[famouswizard]

dev/feature-123 wasn’t ignored due to exact match regex.
updated the pattern to handle nested branches.

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PR-Codex overview

This PR updates the branch name validation logic in the checkBranchNames.js script to ensure that the ignoreBranches regex correctly handles branches named main and dev, allowing for sub-branches.

Detailed summary

• Modified the ignoreBranches regex from /^(main|dev)$/ to /^(main|dev)(\/|$)/ to accommodate sub-branches under main and dev.

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