chore: standardize enterprise Dependabot configuration

[somethingwithproof]

Adds grouped, cooled-down Dependabot updates with standard ecosystem labels and commit prefixes.

[github-advanced-security]

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[Copilot]

Pull request overview

Adds repository automation for dependency management and security scanning, aiming to standardize Dependabot behavior and introduce CodeQL analysis in CI.

Changes:

• Add a CodeQL GitHub Actions workflow to analyze the repo on pushes/PRs and on a weekly schedule.
• Add a Dependabot configuration for grouped GitHub Actions updates with labels, commit message prefixing, and a configured cooldown.

Reviewed changes

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

File	Description
.github/workflows/codeql.yml	Introduces CodeQL scanning workflow with a language matrix and scheduled runs.
.github/dependabot.yml	Configures Dependabot for GitHub Actions updates targeting develop, with grouping/labels/prefix/cooldown.

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