Before entering Main, check for showPolicy query param to show policy

[nucleogenesis]

Summary

Description of the change(s) you made

In beforeRouteEnter in Main.vue we check the to.query.showPolicy - if it's a valid policy it'll be shown to the user. Includes a check to help be sure this is the first page load.

The URLs would be:

https://studio.learningequality.org/en/accounts?showPolicy=privacy_policy
https://studio.learningequality.org/ar/accounts?showPolicy=privacy_policy
https://studio.learningequality.org/es-es/accounts?showPolicy=privacy_policy
https://studio.learningequality.org/fr-fr/accounts?showPolicy=privacy_policy
https://studio.learningequality.org/pt-br/accounts?showPolicy=privacy_policy

https://studio.learningequality.org/en/accounts?showPolicy=terms_of_service
https://studio.learningequality.org/ar/accounts?showPolicy=terms_of_service
https://studio.learningequality.org/es-es/accounts?showPolicy=terms_of_service
https://studio.learningequality.org/fr-fr/accounts?showPolicy=terms_of_service
https://studio.learningequality.org/pt-br/accounts?showPolicy=terms_of_service

https://studio.learningequality.org/en/accounts?showPolicy=community_standards
https://studio.learningequality.org/ar/accounts?showPolicy=community_standards
https://studio.learningequality.org/es-es/accounts?showPolicy=community_standards
https://studio.learningequality.org/fr-fr/accounts?showPolicy=community_standards
https://studio.learningequality.org/pt-br/accounts?showPolicy=community_standards

Reviewer guidance

How can a reviewer test these changes?

Run the changes, then replace studio.learningequality.org in the URLs listed above with the one you use to access your testing instance and see that they work.

Are there any risky areas that deserve extra testing?

Go back & forth. Sign in, out, etc. It should only show the policy if it is the initial load of the page.

References

Closes #4133

Comments

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Contributor's Checklist

PR process:

• If this is an important user-facing change, PR or related issue the CHANGELOG label been added to this PR. Note: items with this label will be added to the CHANGELOG at a later time
• If this includes an internal dependency change, a link to the diff is provided
• The docs label has been added if this introduces a change that needs to be updated in the user docs?
• If any Python requirements have changed, the updated requirements.txt files also included in this PR
• Opportunities for using Google Analytics here are noted
• Migrations are safe for a large db

Studio-specifc:

• All user-facing strings are translated properly
• The notranslate class been added to elements that shouldn't be translated by Google Chrome's automatic translation feature (e.g. icons, user-generated text)
• All UI components are LTR and RTL compliant
• Views are organized into pages, components, and layouts directories as described in the docs
• Users' storage used is recalculated properly on any changes to main tree files
• If there new ways this uses user data that needs to be factored into our Privacy Policy, it has been noted.

Testing:

• Code is clean and well-commented
• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Any new interactions have been added to the QA Sheet
• Critical and brittle code paths are covered by unit tests

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Reviewer's Checklist

This section is for reviewers to fill out.

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[nucleogenesis]

Any simpler/better conditions here?

The issue suggests this is particularly to accommodate users who have not signed up yet. I considered maybe using a route name (ie, is this only on the account sign in page?)