use nightly build for acceptance module

[mehul-jain1]

Summary

This pull request updates the GitHub Actions workflows to ensure that the acceptance tests are run with the --nightly flag in both the continuous integration and nightly workflows.

Workflow configuration updates:

• .github/workflows/ci.yml: Added the flags: '--nightly' parameter to the Acceptance job to ensure nightly-specific tests or behaviors are triggered during CI runs.
• .github/workflows/nightly.yml: Added the flags: '--nightly' parameter to the Acceptance job to ensure nightly-specific tests or behaviors are triggered during nightly runs.

Additional Context

Add any additional context about the problem here.

• Root cause and the steps to reproduce. (If applicable)
• Thought process behind the implementation.

Related Issues (if any)

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Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified. (For example puppet apply)