feat: Add CSP options to dashboard

[dblythy]

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

Currently, Parse Dashboard cannot be used with strict CSP

Closes: #2392

Approach

Adds dashboard options:

• options.strictCSP, which sets the express app's CSP to strict
• options.CSPNonce, which is a string that can be used to set nonce, in case the developer wants to override

TODOs before merging

• [x] Add tests
• [ ] Add changes to documentation (guides, repository pages, in-code descriptions)

[parse-github-assistant[bot]]

I will reformat the title to use the proper commit message syntax.

[parse-github-assistant[bot]]

Thanks for opening this pull request!

• 🎉 We are excited about your hands-on contribution!

[dblythy]

I'm going to set strictCSP to true so we can preview the PR

[uffizzi-cloud[bot]]

Uffizzi Ephemeral Environment deployment-16677

:cloud: https://pr-2393-deployment-16677-parse-dashboard.app.uffizzi.com

:page_facing_up: View Application Logs etc.

What is Uffizzi? Learn more

[uffizzi-cloud[bot]]

:exclamation: Preview failed: invalid compose        Uffizzi was unable to deploy a preview of this pull request because the compose file in this branch is invalid.

[uffizzi-cloud[bot]]

:exclamation: Preview failed: invalid compose        Uffizzi was unable to deploy a preview of this pull request because the compose file in this branch is invalid.

[mtrezza]

Any specific reason this has been closed?