#463 - added topic url's to graph page

[bracyw]

Changes

Added syncing topic selection to url param on graph screen, to allow for sharing of current viewed topic via url to others.

Notes

Had to add a little bit weird of a line to make sure that syncing still happened on initial load as we have to wait for available topics to load first.

Test Cases

• Topic selection still works
• Topic de-selection still works
• On page reload topics are loaded correctly.
• URL is synced with topic selection

Checklist

It can be helpful to check the Checks and Files changed tabs.
Please review the contributor guide and reach out to your Tech Lead if anything is unclear.
Please request reviewers and ping on slack only after you've gone through this whole checklist.

• All commits are tagged with the ticket number
• No linting errors / newline at end of file warnings
• All code follows repository-configured prettier formatting
• No merge conflicts
• All checks passing
• Screenshots of UI changes (see Screenshots section)
• Remove any non-applicable sections of this template
• Assign the PR to yourself
• No package-lock.json changes (unless dependencies have changed)
• Request reviewers & ping on Slack
• PR is linked to the ticket (fill in the closes line below)

Closes #463